Acid Definition and 683 Threads

I am planning to use natural sources of citric acid-lemons preferably-to demonstrate a flame retardant mixture using chiefly sodium benzoate(preservative) and ammonium phosphate besides citric acid.Will a natural source work? I suspect the other chemicals in the lemon extract will spoil the...

Hi guys! First time post here. I was wondering where on the internet you could find such a value? I have tried searching for sites that may have a list of molar extinction coefficient values for various compounds but have found them to be quite hard to access. Would any of you with perhaps...

Is it true that an amino acid tends to substitute another if they share similar properties ? Thanks :smile:

can oxy acids make acid salts?

Homework Statement Which one is a stronger acid- o- Toluic acid or p- Toluic acid? The Attempt at a Solution I think o-Toluic acid will be less acidic because CH3 - group is nearer to the O-H bond and it will exert more +I effect compared to that in para- position. But at the same time...

Hi, Would be interested to know why HCL cannot eat through LDPE for example. Thanks, Mike.

Homework Statement A slice of banana weighing 2.502g was burnt in a bomb calorimeter producing a temperature rise of 3.05 C. The combustion of 0.316g of benzoic acid in the same calorimeter produced a tempterature rise of 3.24 C. The heat of combustion of benzoic acid at constant volume is...

Homework Statement Equation 1 - IO3- (aq) + 6 H+ (aq) + 5 I- (aq) -> 3 I2 (aq) + 3 H20 The iodine formed will react with the ascorbic acid. Equation 2 - C6H8O6 + I 2 -> C6H6O6 + 2 I- (aq) + 2 H+ (aq) The goal is to determine the ascorbic acid concentration (mg/mL) in a Vitamin C solution. A...

Homework Statement 1.5000 g of diprotic weak acid H2A was dissolved in 100.00 mL volumetric flask. 25.00 mL aliqouts of this solution was titrated with a monoprotic strong base NaOH (0.08000 M). The titre volume of NaOH was 40.00 mL. Calculate the molecular weight of H2A. Homework...

I know that HI is a stronger acid that HCl because of the weak H-I bond which can break easily in aqueous solution. But I can't understand why HOCl is a stronger acid that HOI (as per my book)?

Hi, Is this the correct equation for Citric acid reacting with Sodium hydrogen-carbonate. C6H8O7 + 3NaHCO3 -> 3CO2 + 3Na+1 + C6H5O73- Is there supposed to be H2O present also??

Homework Statement Lets say we titrate an amino acid with a strong base (NaOH), like I know that the hydrogen of the carboxyl (COOH) group will be pulled away followed by the amino group (NH3+), but is there a particular reason why the hydrogen on the carboxyl group is pulled out first rather...

The Density of a solution of sulphuric acid is 1.8022g/cc, and it is 88.00 percent by mass. What volume of the solution (in milliliters) do you need to supply 43.0 g of sulphuric acid? I'm not too sure how to solve this question, I tried it and thought it was too simple? This is what I did...

Homework Statement This is a lab for Chemistry in grade 12. I'll give some basic info I have. Juice substance is Tang. A solution of juice is prepared by dissolving 4.00 grams of crystals in 100.0 mL of solution. The juice solution is then titrated using a given solution of sodium hydroxide...

Homework Statement The problem is that i am trying to find out the concentration of phosphoric acid in cola. I have completed the titration of 3 different types of cola. I have obtained the pH and volume on the titration graph. Note: I am trying to figure out the overall concentration of H3P04...

This is NOT homework, I am just confused on how to name this organic compound. My chemistry teacher got quite of stumped, let alone i do not believe my fellow class mates in their idea of the name. Example: -----------------------------------------------------------------CH3...

How much lime juice to be used iso. citric acid?? Dear all, I'm now trying to make mozzarella cheese. The recipe wrote that use 1 1/4 tsp. for a gallon of milk (I think US gallon). The problem is I can't find citric acid right now. If I want to try lime juice instead of it, how much of...

Is the acid in salad dressing or fruit any better than the phosphoric acid in common soda pop? Or are the effects of acid only a matter of quantity? (on teeth, or on the lifetime of a small insect, or on general health.)

Homework Statement I'm currently doing an experiment that requires me to use a weak polyprotic acid (triprotic) to neutralize a strong base. I'll be using the acid as the titrant. I need to find out the molarity of the base. Can I still use the M1V1=M2V2 equation in this case? 2. The...

Any known reasons, research, or theories about why earthly amino-acids exist in the L-configuration and have not been found in D-configuration naturally??

Homework Statement Use the information below to answer the following question(s). methyl orange: red at pH < 3.1: orange at pH 3.1-4.4: yellow-orange above pH 4.4 litmus: red at pH < 4.5: purple at pH 4.5-8.3: blue above pH 8.3 thymol blue: yellow at pH < 8.0: green at pH 8.0-9.6...

Hi, firstly apologies for what might seem like a 'basic' question, but I've been trying to work this out for a while. I have a sealed lead acid (SLA) battery - 6V 4AH. I would like to use this battery to power a 4V coil (for a display) - that is capable of (potentially) drawing the full...

Does citric acid "decay"? Hi I'm preparing about 80 mL of citric acid from anhydrous crystals, using 1g of crystals to 1 mL of de-ionized water. It is for the purposes of etching GaAs with a 3:1 citric acid to H2O2 (by volume) mixture. I wait at least a day after making the acid from the...

My set up was simply putting two lead plates into a beaker of sulphuric acid, then connect the lead plates to a power supply. What is the reaction for charging and discharging the cell? All equations I could found contain lead (IV) oxide... Is the reactions of my set up differ from a real...

how can I make a 50% citric acid solution?

Since HC2H3O2 is made up of acetate which is a polyatomic ion, shouldn't it ionically bond with H+? If that's the case, why doesn't it completely dissociate in water and become a strong electrolyte?

Homework Statement The question actually contains a diagram but i don't understand how to draw it, so i'll try to describe it in words. A solution contains phenol, acetic acid, aniline and nitrobenzene. Na2CO3 is added into the solution and two layers are formed: aqueous layer A and ethereal...

Homework Statement When a spring is compressed, potential energy is stored in it. If the spring is dissolved into acid; where does teh potential energy go. Homework Equations P.E = (1/2)*k*a^2 The Attempt at a Solution I tried but got no idea about it.

If a compressible metal spring is compressed it achieves potential energy. But if the spring is dissolved in acid at its clamped state where does the stored potential energy go? Or what becomes of its potential energy. Help me please.

Homework Statement Explain why sodium azide has a lower solubility than hydrazoic acid in hexane. Homework Equations The Attempt at a Solution How to determine the solubility of solution in organic compounds? Thankyou

Homework Statement 100mL of 0.10M HNO3 was added to a 100mL mixture containing 0.30M acetic acid and 0.10M sodium acetate. Ka = 1.8 x 10-5 Homework Equations CH3COOH \rightarrow H+ + CH3COO- CH3COONa \rightarrow Na+ + CH3COO- CH3COO- + H+ \rightarrow CH3COOH The Attempt at...

Homework Statement Hi. I'm reaady to panic right now so if anyone could please take the time to answer my question I would HUGELY appreciate it! I seriously need to get this done soon as I also have a test tomorrow and i just want to cry because I'm getting nowhere... We did a lab...

Question: What is the pH of a solution made by mixing 0.30 mol NaOH, 0.25 mol Na2HPO4, and 0.20 mol H3PO4 with water and diluting to 1.00L? My work: So I found that the Ka value of H3PO4 is 7.5*10^-3 and the Ka value of HPO4 (found in Na2HPO4) is 4.2*10^-13. Because Ka of HPO4 is so small...

A 25.0 ml sample of 0.150 M HNO2 is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of HNO2 is 4.50x10-4 What I can't get is the fact I don't know how much has already been titrated at the equivalence point. So it's difficult to know the total volume...

Homework Statement OK so this is my first time actually posting but I have lurked around. I need help with two of my chemistry problems. Problem 1 Decide which one(s) of these answer choices are correct. A buffered solution is one which can be desribed by which of the following...

I was wondering if I did something wrong with the deletion, it seems pretty self explanatory but I just want to make sure I did this right. The filled in answers are in bold And I'm completely lost with the Amino Acid sequence, my TA did this in class and I still don't get it. Sequence of...

Homework Statement V205(s) + U(s) ---> V0 2+(aq) + UO2 2+(aq) *Balance the rxn under acidic conditions. *Balance the rxn under basic conditions.

what is the shape of acetic acid？

Homework Statement A student titrated 10.00-mL aliquots of her unknown amino acid solution with standard 0.1521M NaOH (18.61mL) and with 0.0986M HCl (3.28mL). Calculate the concentration of the amino acid. Assume the amino acid contains both the A & A- forms of the amino acid. Homework...

for example, ethanoic acid in water, "="means equilibrium arrows CH3COOH(aq) + H2O(l) = CH3COO-(aq) + H3O(aq) we take the pH as the -log of the concentration of H3O ions. BUT why do we not take in account the effect of the ethanoate ion with water which produces OH-? CH3COO-(aq) +...

In our chemistry class, we learned that an acid is a molecular compound that release hydrogen ions when they are dissolved in water through a process called ionization. So are both Hydrogen Sulfide (g) and Hydrosulfuric Acid (aq) acids?

Case:1 I have one iron spring. I compress it gives potential energy E= ½* K*x2 & bind it by glass wire which is not melted in acid. Now I put this spring in acid & it melted completely, So where the potential energy gone? Case:2 I put one magnet in glass vessel & hold it in vessel by some...

Homework Statement Is H3CC(=O)CH2CH3 more likely to act as a Lewis Acid or Lewis Base? Explain your choice. Same for HCO2H (formic acid)Homework Equations N/AThe Attempt at a Solution Since a Lewis Base donates electron pairs, and the oxygen in H3CC(=O)CH2CH3 has two lone pairs, I reasoned...

Acid dissociates in water to form H3O+ and OH- but the formal charge on the oxygen atom in H3O+ is +1. Shouldn't the oxygen atom have a negative formal charge since it is more electronegative than hydrogen atom?

http://img19.imageshack.us/img19/2692/chptitration.jpg http://img130.imageshack.us/img130/6351/titrationfigure1.jpg 1.)For the titration of strong acid and strong base, and at the beginning of the curve, how to explain the big amount of base added only increase a little of the pH value...

I recently did an experiment with the following reaction: NH_4^+ + OH^-<-->NH_3+H_2O I added phenolphthlein, which is magenta in the presence of base. Now, I have to explain, after adding certain chemicals why I have certain color. The one color change I am having trouble explaining...

Homework Statement NaOH(aq) + HCl(aq) ------> NaCl(aq) + H2O(l) 50mL of 1.0M HCl and 50ml 1.0M NaOH was mixed. Total heat is 2826J. If the density of 0.5M NaCl produced in this reaction is 1.02g/mL: a) What is the mass of the solution? b) Moles of water formed c) Moles of NaCl formed d) Molar...

Would you expect to that Aspirin and Ibprofen are more or less soluble in water than benzoic acid? ( I believe it has something to do with the polarity of the bonds but I am unsure how to choose between the two.)

Homework Statement We break down the rxn of NaOH with HCl into putting solid NaOH pellets in water and determine the delta H value. Next, we mix aqueous NaOH with a HCl (aq) and determine the delta H. Then we mix solid NaOH pellets in HCl(aq) and measure the delta H. Can we say that the...

Homework Statement why does C2H5OH not affect the equilibrium of H+(aq) + 2CrO4-2(aq)---- yielding in a reversible reaction-----Cr2O7-2(aq) + OH-(aq) Homework Equations The Attempt at a Solution Is it because C2H5OH is such a weak acid that it does not dissociate and therefore...