Ph Definition and 512 Threads

What is the pH of hydroxylamine? From my calculations, it is 6.04. But it is a base. So why is it less than 7?! For calculations I just used the Henderson-Hasselbalch equation. The Kb is 1.10*10^-8, and when 0 ml of titrant has been added, the pH would be 6.04.

In an experiment we did, we simply added 5ml of 0.1ml HCl into 20ml of a .5M solution of an unknown weak base. I'm not sure how we calculate the equilibrium constant though We know the pH is 5.855 which means the pOH is 10^-(14-5.855) = 7.161 x 10^-9. Now I'm a bit confused. Is the [HB+]...

Hey all. It has been a while. I have been interested in electrolysis for a while now and have been learning how different factors affect the reaction, e.g. distance of electrodes, concentration of solution, volume of solution electrolysed etc. However I am having problems finding research...

What is the pH of 340 mg of Ca(H2PO4)2 in 600 mL H20? Well, find M of Ca(H2PO4)2 by converting mg -> g -> mol and M = mol Ca(H2PO4)2/.6 L Is Ca(H2PO4)2 a buffer? I don't know what to do. Do you do an equation of Ca(H2PO4)2 --> Ca (2+) + H2PO4 (-). What steps must I follow? Thank you...

Both are confusing me. I don't know what information to use (K values) I'd really appreciate some help! Calculate the concentration of all species present in a 0.25M solution of ethylammonium chloride (C2H5NH3CL) (Not sure you if you may need this, but C2H5NH2 has a Kb value of...

1. What is the hydronium ion concentration and the pH for an aqueous solution of NH3 that has a hydroxide ion concentration of 2.25E-3 M? a. 4.44 x 10-11 M, 3.65 b. 4.44 x 10-11 M, 10.35 c. 4.44 x 10-12 M, 2.65 d. 4.44 x 10-12 M, 11.35 [OH] = 2.25E-3 pOH = -log(2.25E-3) = 2.6478...

ok, sorry. Couple of dumb questions..:redface: We had a lab last night, and one part involved testing the pH of various substances (we used the little strips of litmus paper and measured the color against a chart). My group tested pure water and we obtained a pH measurement of 7. Another...

Hi, I got a problem with something regarding to chemistry. How can you determine the pH of a solution with two Acids? The question says that A 50.00 mL aqueous solution is made by mixing the following two solutions: 10.00mL 1x10^-9M HCl 50.00mL 1*10^-4 M CH3COOH (Ka= 1.8*10^-5) a)...

I'm being asked to find the pH of a 0.050 M solution of NaCN. I figured out the expression to be x^2/ 0.050 -x, now all i need is a value for k, however I'm not given that value. I know the pH depends on the molarity of the hydrogen ion at equilibrium, however to find that I need to find x...

What is the pH of a solution containing 50.0g of (Na_3)(PO_4) in a liter of solution? We are given that (Na_3)(PO_4) is very basic.

Hi. I am having trouble with acid-base titration excercises. 0.02 L butanoic acid @ 0.1 M is titrated with 0.01 L NaOH solution @ 0.1 M. The Ka of butanoic acid is 1.54X10^-5. Find the pH. The answer is 4.81. I know how to find the pH when no NaOH is added, but I really don't see how the...

Can anyone tell me how to calculate pH of an strong and weak acid with conc 10^-^7 M . Please just explain the method. i read a little about it. Why is it necessary to take into consideration the change in conc of H^+ from water? -Benzun

Question: Aspirin is a weak acid. (a) Calculate pH of 0.2M solution of aspirin at 25 degrees celsius (Ka = 3.0 x 10^-4 at 25 degrees celcius). (b) Determine the percent ionisation (c) Explain qualitatively the effect of adding 0.01M hydrochloric acid to the aspirin solution. (d)...

can anyone tell me what parts of the digestive secretion have high basic pHs of 8-9.0...and they gradually increase in effectiveness for certain jobs

Hi. I was wondering if someone could please explain how to do this question. Find the pH of 1 L buffer (1 mol/L CH[SIZE="1"]3COOH, 1 mol/L CH[SIZE="1"]3COO-) when 0.1 mL 1 mol/L HCl is added. Help would be appreciated. Thanks in advance.

Hi everyone i have comed across a fairly difficult question in chemisty that's been baffling me. A 51.1 mL of 0.153M NaOH was mixed with 27.5mL of 0.0147M H2SO4. What is the pH of the resulting solution. What I want to ask is shouldn't the resulting solution, water, be neutral with pH of 7...

I am asked to prepare some information on ph scale. I know what pH is, I know how to calculate it in some cases, I know it is lower than 7 for acid and higher then 7 for base - is there anything more important? G

The tern "buffer" is used in many products. What is a buffer? Some weak acids and bases work as a buffer system. Biocarbonate (HCO3-) is a common ion in your blood stream which acts as a buffer. Write an equation for how the pH of blood is restored to normal range when it bocomes acidic using...

Hi, I've got this question where I have to describe two methods of measuring the pH of a substance. I've already got the one using electrochemical potentials, but I'm a bit stumped on the second method. What I've said is to carry out a titration with an alkali until the solution is...

Hi Guys! cakculate the pH of a 0.1M acetic acid when it is half neutralized by NaOH solution (Ka= 1.7 x 10^-5) Ans: 4.7695 My dear friends! I am unable to understand the language of this question , Please tell me this question in some easier words so that i can just solve it on. A...

I have a question about pka and pH say that the pka of Acetic acid is 4.7 and the ph of the solution is 3.5, that means that the solution is acidic so it wants to donate protons, would that mean that Acetic acid in this solution would be in the protonated form, that means it will not donate it...

Hi, My Question: Upon evisceration, it was discovered that the frog had died due to acid ingestion. 10mL of gastric juice was found in its stomach required 7.2mL of 0.1 M NaOh for neutralization. Calculate the pH of its gastric juice. I'm confused, how would I approach this problem...

Why is the following true?: \left[H^+\right]\left[OH^-\right]=10^{-14} It seems like they would cancel out (equal 10-7 instead). Thanks for your help.

when you add 10.0 mL of 1.0M HClO4 into 990.0mL water, the pH changes by 2. how would you find the change in pH?

I'm trying to show my students that CaCO_3 is basic. Ca^2^+ comes from Ca(OH)_2, which is a weak base due to it's low solubility. CO_3^2^- comes from the weak acid HCO_3^-. To compare the two we compare: 1) Ca^2^+ + H_2O --> Ca(OH)_2 + H_3O^+ and 2) CO_3^2^- + H_2O --> HCO_3^- +...

Which would you use advising, a ph meter or acid/base titration? advantages/disadvantages to both?

Urea? pH level of it? Does anyone know the pH level of Urea or Sweat? I can't seem to find this info anywhere, although I think both is basic since they contain ammonia.

A torque of 70 N-m acts for 10s on a disk with moment of inertia 160kg*m^2. If the disk is originally stationary, what's final angular speed of the disk?

quote from http://www.chem.ubc.ca/courseware/pH/section15/content.html Intuition may suggest that the endpoint of the titration will occur at the equivalence point if we choose an indicator whose pKa is equal to the pH of the equivalence point. If such an indicator was chosen, the colour...

This pH calculation question is only for those interested, but I wan't to do it, but I have no idea where and how to start... What is pH of solution of 0.1M diprotic acid if loarithms of overall protonation constants are 4.3 and 5.5. What is going on? No idea how to start... Borek, are...

1. Two HCl(aq) solutions have pH= 2.00 and pH= 3.00, respectively. If equal volumes of these two solutions are combined, the pH of the resulting solution wil be ... Now I know the answer is 2.26 but I don't know how to actually solve it.. 2.Aniline(C6H5NH2) is a weak base. At 25C, a 0.100M...

Hi ppl. I have a question. I'm given the pka of ethanoic acid/ethanoate ions at 4.75 and i have to work out the ph of a 5*10^-2 moldm3 solution of sodium ethanoate. I worked it out by getting the Ka from 10^-4.75 and then saying that the concentration of Ch3COO- in the dissociation of ethanoic...

pH -- really basic, I know, but I'm tired Hi Chem masters out there, Anyone want to help me with this one? What is the pH of a solution with 10 g of sodium carbonate and 10 g of sodium bicaronate dissolved in enough water to make 0.25 mL of solution?

Which is stronger (lower pH): {\text{HBrO}}_{\text{4}} or {\text{HIO}}_{\text{3}} ? How would I name {\text{HIO}}_{\text{4}} -- Periodic acid, I suppose? If perchoric acid is {\text{HClO}}_{\text{4}} , why then is periodic (per-iodic) acid {\text{H}}_{\text{5}}...

Hi, can someone please give me a hint to this problem? The concentration of SO2 in the troposphere over a certain region is 0,16 ppm by volume. The gas dissolves in rainwater as follows: SO2(g) + H2O(l) >> H+(aq) + HSO-3(aq) Given that the equilibrium constant for the preceding reaction is...

I a have a broad background in chemistry so I know the basics. I was looking at a tanning product and this was the guy's big claim "All these ingredients have high pH levels of over 6! What does this mean? A pH of over 6 is the COLOR ORANGE!" Now, I wasn't aware that pH could change the color of...

Captain Kirk, of the Starship Enterprise, has been told by his superiors that only a chemist can be trusted with the combination to the safe containing the dilithium crystals that power the ship. The combination, which consists of four numbers, is the pH of solution A described below, followed...

Assuming the first ionization of sulphuric acid is 100% and the K_{a2} of sulphuric acid is 0.10M at 25 degree celsius.(Ka is the acid disocciation constant) a. Find the pH of a 0.1M NaHSO_4 b. Calculate the molarities of H^+, HSO_4^-, SO_4^{2-} respectively in 0.1M H_2SO_4 Here are my...

I am trying to find what the new concentration of OH^{-} in a solution of potassium hydroxide (pH = 11.65) is after diluting it with water to six times the original volume. It is at 298.15 K (25 degrees Celcius). I have found the concentration of H_{3}O^{+} and I guessed that I just multiply...

In the human alimentary canal, starch is broken down by amylase. The pH of the alimentary canal varies batween pH 2 and pH 8.5. My question is how we can ivestigate the effect of pH on the activity of the amylase. thank you.

I need to know: In a closed system sealed off from outside air, if water from a mass of basic water evaporates, will the pH of the air be affected? If so, when the air condenses, how wil the pH of soil in the closed system be affected? Thanks for the help.

Does anyone know if it is possible use a soil pH meter to measure the pH of liquids (ie. not soil)? Or a better way to phrase it, is there any diference between a soil pH meter and a normal pH meter meant to be used on liquids that would cause inacuracies or other problems if one was...

1.00 g of formic acid and 1.00 g of potassium formate acid are dissolved in enough water to give 100.0 ml of solution. Calculate the pH of the solution. >> I'm not really sure how to start this. These are two acids being mixed together... Would there be a reaction? I'm very confused on how...

I'm posting this here because I don't know the legitimacy of the topic and whether it qualifies for discussion in the other physics sections. Curious thing happened today that's got me wondering... I met someone who represented a company that apparently sells healing and therapeutic...

Does anyone know whether there is any university having researches on General Relativity itself, not its application in Astrophysics? If so, what mathematics do I need rather than differential geometry?

50.00 mL of 0.1000 M citric acid (Ka = 7.41 x 10^-4). titrated 50.00 mL NaOH added. Calculate pH. I have equal moles of Acid and equal moles of Base. But, I am titrating a strong base into a weak acid. So, instead of my pH being 7, I assume it should be just above 7. But, I am not...

1. what is the pH of a solution that contains 1.56X 10^5 M hydrogen ions ? 2. Is there a pH above which the molarity of hydrogen of water is higher that the molarity of hydrogen ions derived from the dissolved chemical, and what is it? 3. What is the pH of 10^-8 M solution of HCl, when HCl...

what is the relationship between Algae and pH value? why there are more algae ,pH value rises?

Is it really possible to have strong acid/bases with a negative pH in practice, or is it purely theoretical. Like we say 10M HCl has pH = -1, does it really? Is there something that limits the range of possible pH values for a solution?

Hi ppl, I got a problem with this question Calculate the pH of 2.00dm3 of an aqueous solution which contains 12.4g of CH3NH2 and 13.5g of methylammonium chloride, CH3NH3+Cl-. The Pka of methylammonium chloride is given as 10.8 Thanks a lot for any help, Joe