Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol⋅dm−3 in SI unit. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M. To avoid confusion with SI prefix mega, which has the same abbreviation, small caps ᴍ or italicized M are also used in journals and textbooks.
Homework Statement
Calculate the initial molarity of S2O32- in each trial given that each trial has 1.00 mL of .010 M Na2S2O3 and a total volume of 7.00 mL.
Homework Equations
mol = g/(g/mol)
M1V1=M2V2
The Attempt at a Solution
(1)(.01)=7x
.0014=x
Homework Statement
Calculate the molarity of the Co^2+ ion in each of the solutions 1-5. The new molarity is given by the molarity of the stock solution multiplied by the dilution factor.
Solution: Co(NO3)2
Original molarity: 0.160
Dilution #1: none
D#2: 12mL to 16mL
D#3: 8mL to...
i combined 5 mL of 0.20 M Fe with 1 mL of 4.0x10^-4 M HSCN and 4 mL of 0.5 M HNO3
i am asked to find the molarity of FeSCN.
i am given this statement: "The concentration of Fe is so high relative to that of HSCN that we can assume that all SCN present is in the complexed form, FeSCN. In...
Homework Statement
Sodium carbonate is often added to laundry detergents to soften hard water and make the detergent more effective. Suppose that a particular detergent mixture is designed to soften hard water that is 3.8×10^−3 M in Ca2+ and 1.1×10^−3 M in Mg2+ and that the average capacity...
Homework Statement
When a reaction mixture with a total volume of 4 L that contains 9.99 g of solid CaSO4 was stoichiometrically produced as per the balanced equation with 2.50 L of aqueous Ca2+, what molarity (M) of Ca2+ was required?
Al2(SO4)3(aq) + 3 CaBr2(aq) → 2 AlBr3(aq) + 3 CaSO4(s)...
Homework Statement
Eighty-six proof whiskey is 43 percent ethyl alcohol, CH3CH2OH, by volume. If the density of ethyl alcohol is 0.79 kg/L, what is the molarity in whiskey.
Homework Equations
Molar Mass of CH3CH2OH = 46.07 g
The Attempt at a Solution
0.79 kg/L * 1000 g/kg * 1...
Homework Statement
Given a 0.1 M solution of Ba(MnO4)2
Homework Equations
What is the Normality if it is used as an oxidizing agent in strong acid (Mn2+ formed)?
What is the Normality if it is used as an oxidizing agent in a weak acid (MnO2 formed)?
Define strong and weak in...
A 205 mL sample of ocean water is found to contain 7.2 g of NaCl, what is the molarity of the solution?
(The problem also says, with respect to NaCl?)
Ok, now, what do they mean with respect to NaCl?
What is it usually in respect to?
Anyways is this the correct way to do this...
Homework Statement
http://tinypic.com/view.php?pic=20752lh&s=5
The Attempt at a Solution
http://tinypic.com/view.php?pic=20752lh&s=5
Homework Statement
Homework Equations
Im having trouble with the last column in the first box. any help would be appreciated.
The...
Homework Statement
Calculate the mass (in grams) of KHP required to react completely with the NaOH in 35 mL of 0.100M NaOH.
KHP = KHC8H4O4(aq)
molar mass of "KHP"= 204.2 g/mol
Homework Equations
This is a double replacement reaction of the acid-base neutralization type. In other words the K...
The questions asks us to: Determine the molar concentration of I- in a reaction mixture. The reaction was as follows (data):
20 mL of .1 M KI
0 mL of .1 M KCl
10 mL of .003 M Thiosulfate
20 mL of .10 M Persulfate
I did the following:
20 ml I- x (1 L / 1000 mL) = .02 L I-
.02 L I- x (.1 mol /...
if i have a 40 micromolar concentration of stock solution and add .01 mL of that solution to .98mL of water, what is my final concentration.
Thanks for any help!
Homework Statement
A student performing this experiment tirates 22.32 mL of vinegar with 0.5172 M NaOH. The initial NaOH buret reading is 1.18 mL and the final NaOH buret reading is 21.35 mL. What is the molarity of HOAc in the vinegar sample?
Homework Equations
The Attempt at a...
Homework Statement
21.76g Cr(III) Sulfate is dissolved in enough water to give 500.0 mL of solution. 10.00 mL of this solution is pipetted into a 250.0mL volumatric flask and diluted to the mark.
a) Calculate the molarity of Cr(III) Sulfate in original solution
b) Calculate the molarity of...
Homework Statement
Lactose (C12H22O11; MM=342) is a sugar found in mamalian milk. The density of a 12.0% solution is approximately 1.06 g/mL. What is the molarity, molality, and mole fraction of the solution?
Homework Equations
M=g/L, m=mol/kg, molefraction=mol/mol??
The Attempt...
Homework Statement
If 50ml of 0.004M H2CrO4 was combined with 50 ml of 0.005M HNO3 what is the pH of the resulting solution?
Homework Equations
Moles H3O=Moles OH ?
Formula for KA
The Attempt at a Solution
So, here's what I have so far.
I made the H2CrO4 represent the acid...
Homework Statement
hey guys, i got a problem. "concentated nitric acid is 70.7% HNO3 (molar mass=63g) and 29.3% H20 by mass. the density of the solution is 1.42gcm. what is the molarity.
Homework Equations
i know i should rearrange the formula d=m/v but i can't work out the mass becuase...
This is the question:
Steps:
I solved for the molar mass of 3 choices, but I don't know how to get the molar mass from the problem. I can get # of moles in the solution but what about gram?
molar mass= gram/moles...
tnx
Homework Statement
hey i really can't do this question, can anyone help. A mixture was made from solutions of sodium sulfate and aluminium sulfate.
311 mL of 0.500 M Na2SO4 solution and 190 mL of 0.300 M Al2(SO4)3 solution were mixed together. Calculate the concentration of SO42- ions in the...
Having a massive brain fart... SIMPLE "molarity -> molality" conversion...
This isn't even a homework question per se, I'm just trying to understand how the question converted the molarity to the molality value, via the density given. I just got a different value of molality when trying to...
Homework Statement
To 25.000 mL of distilled water in a 50 mL beaker, you add exactly 19 drops of 0.100 M HCl and swirl to mix. If exactly 20 drops of HCl are required to make 1.000 mL
Homework Equations
Calculate molarity of the diluted HCl and pH of the diluted HCl
The Attempt...
Homework Statement
"A scientist prepares 100 mL of an iron (III) nitrate solution by weighing out 4.8372 grams of the solid iron (III) nitrate and dissolving it in deionized water using a 100 mL volumetric flask. She then pipettes 5 mL of that solution into a 20 mL volumetric flask and...
Homework Statement
I wasn't sure about some of these problems, am I doing them correctly?
1) What volume of each of the following bases will react completely with 25.00 mL of 0.200 M of HCl?
a) 0.100 M NaOH
.02500 L x .200 mol HCl/1 L = .00500 mol HCl
.100 M NaOH = .00500 mol...
Homework Statement
A solution containing equal masses of glycerol, C3H8O3, and water has a density of
1.10 g/mL. Calculate the (a) molarity; (b) mole fraction of glycerol; (c) molality of
the solution.
Homework Equations
M=moles of solute/liters of solution
mole fraction = n1/n(total)...
mental block about this please help.
molarity is mols or a substance per Liter of a solution right?
that is, mols of the solute in litres of solution.
1. What is the solution?
2. if its water, then how can you say water has a molarity?
Here is the problem..
Calculate the molarity of a 0.342M sugar (C12H22O11) solution that has a density of 1.12g/mL.
The answer is 0.341m but I don't know the steps..
Please help me with this problem :(
I have problem and can not solve it:
A piece of metallic aluminum weighing 2.50 grams is treated with 75.0 mL of sulphuric acid ( d = 1.18 g/cm3 , 24.7% H2SO4 ). After the metal is dissolved, the solution is diluted to 400mL.
a) Calculate the morality of the solution with respect to the...
Hi,
I have to make up a 0.5N solution of HNO3 (69%). I have attempted to do the calculation but am not confident if it is correct. Please see below:
no. moles = cv/1000
c = 0.5N v = 100ml
so no.moles = 0.5 x 100/ 1000 = 0.05 moles
mass = 0.05moles/63 = 3.15g
HN03 (69%) =...
Could you please help me out with this?
What would be the weight of 1 litre of a 1 Molar solution of Cu2Cl2?Cu2Cl2 is a dimer of CuCl right and some of it should dissociate to give the same right?
so will it be equal to that of
a)molecular weight of Cu2Cl2?
b)Molecular weight of CuCl...
Just having some problems understanding why one is dependent on pressure and temperature and the other is not. If molarity is moles of solute/litres of solvent, why would this change with pressure and temperature? A litre of water will remain a litre of water at any given temperature and...
Homework Statement
If you mix 200mL of a 1.8M HCl solution with 300mL of a 1.16M NaOH solution, what will be the pH of the solution?
The Attempt at a Solution
Well I am really lost with this problem. I am pretty sure you need to convert each to moles.
.2L HCl x 1.8moles HCl...
Homework Statement
What volume of water must be added to 45.0 mL of a 1.0 M solution of H2SO4 in order to create a 0.33 M H2SO4 solution?
answer:91.4 mL
vat contains 2.24 M hydrochloric acid solution. How many kg of Ca(OH)2 will be required to react completely (neutralize) 796 L of the...
Homework Statement
another satII chem question:
Forty grams of sodium hydroxide is dissolved in enough water to make 1 liter of solution. What is the molarity of the solution?
(A) 0.25 M
(B) 0.5 M
(C) 1 M
(D) 1.5 M
(E) 4 M
Homework Equations
Molarity = (number of moles of solute) /...
This is probably an incredibly easy one for you, but it's frying me. I'm in AP Chem, and since I'm involved in a lot (excuses, excuses...tsk tsk...), my brain is fried and it's having trouble clicking. My teacher is unhelpful, even hostile, and the book provides no explanations. For example...
Hello people...could u help me pls...coz i am rly stuck in these thing like calculations...i know all right answers but i am not too sure how to get them...please if somebody of us has a few minutes could u help me with that?
Thank you very much.
1.,
When 0.25 g of sodium metal was added...
Homework Statement
A student accidentally spills 227 mL of distilled water into a beaker containing 0.5 M potassium nitrate solution
A) What is the new molarity?
Homework Equations
Molarity = moles/liter
The Attempt at a Solution
I'm just REALLY confused, and I would appreciate ANY...
What is the molarity of a solution of silver perchlorate, AgClO4, if 3.2 moles of silver perchlorate is dissolved in 1.5 liters of water? Is it 2.133 M, 4.756 M, 4.8 M, or 4.810 M ?
i guessed 2.133 M
2. How many moles of potassium iodide, KI, must be used to make 1.500 L of a 0.2 M solution...
Homework Statement
What is the molarity of 50.0mL sample of aluminum sulfite when it is reacted with 3.00M solution of barium chloride? The product of this double replacement is aluminum chloride and barium chloride.
Homework Equations
The first thing i did was balance(all number after...
Calculate the molarity of a solution of ethanol in water,in which the mole fraction of ethanol is 0.040.
Can anyone help me to solve this problem?:bugeye:
Here is a question that i have on a test review and neither the book or the teachers examples are any help.
If 200mL of 0.800 molar HClO is added to 400mL of 0.200 molar Ba(OH)2 solution, the resulting solution will be ________M in Ba(ClO4)2.
I know that the answer is 0.133M
i know...
Pleez Help Me!
when a solution of sulphuric acid was standardised the following results were obtained. exactly 5.3g of pure anhydrous sodium carbonate were dissolved in wter and made up to 250cm3 of solution. 25cm3 of this solution were neutralised by 20cm3 of the acid. calculate the molarity...
Please check my work!
1) In the preparation of a solution of sulfuric acid, 26.7g of SO3 was dissolved in enough water to prepare 8.20L of solution. What is the concentration of sulfur (moles per liter) in this solution?
Equation given: SO3 (g) + H2O (l) --> H2SO4 (aq), which is already...
Hello! In my chemistry lab we did an experiment where the purpose was to find the estimated concentration of sugar in unknown solutions. We used 10 mL of each solution, and I determined the mass of the solution of each unknown. From there I calculated the density (mass over volume). Using that I...