CHEM 24112 Chapter Notes - Chapter 15: Potassium Bromide, Volumetric Flask, Sodium Hydroxide

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Homework 15.3: Molarity

1. A solution you used in a lab experiment was labeled “3 M HCl.” Describe in words the composition

of this solution.

2. A solution labeled “0.110 M CaCl2” would contain _______________ mol Ca2+ and ______________

mol Cl- in each liter of the solution.

_____ 3. To prepare 500. mL of 1.02 M sugar solution, which of the following would you need?

a. 500. mL of water and 1.02 mol of sugar

b. 1.02 mol of sugar and enough water to make the total volume 500. mL

c. 500. g of water and 1.02 mol of sugar

d. 0.51 mol of sugar and enough water to make the total volume 500. mL

4. For each of the following solutions, the mass of solute is given, followed by the total volume of

solution prepared. Calculate the molarity.

a. 1.37 g of NaOH; 125 mL

b. 4.29 g of KI; 250. mL

c. 2.95 mg of Pb(NO3)2; 4.95 mL

d. 0.997 kg of NaNO3; 125 L

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Related Questions

1.This question has multiple parts. Work all the parts to get the most points.

In each of the following sets of ionic compounds, identify the members of the set that are soluble in water.

(Select all that apply.)

NH₄I

NH₄HCO₃

NH₄NO₂

NH₄NO₃

(Select all that apply.)

NaCH₃COO

AgCH₃COO

Cu(CH₃COO)₂

Cr(CH₃COO)₃

(Select all that apply.)

CaBr₂

Ca(OH)₂

CaSO₄

CaCl₂

(Select all that apply.)

Ca(NO₃)₂

CaSO₄

CaCO₃

Ca₃(PO₄)₂

2.Calculate the mass percent of solute in the following solutions.

(a) 8.94 g of NaCl dissolved in 55.5 g of H₂O	%
(b) 3.52 g of LiBr dissolved in 38.6 g of H₂O	%
(c) 14.4 g of KNO₃ dissolved in 260 g of H₂O	%
(d) 2.6Ã10^-3 g of NaOH dissolved in 3.8 g of H₂O	%

3.How many grams of water must be added to 49.5 g of NaOH in order to prepare a 6.73%(m/m) solution?

grams of water

4.Calculate the volume percent of 495 mL of acetone in enough water to give 1.07Ã10³ mL of solution.

%(v/v)

5.How many grams of Na₂CO₃ are needed to prepare 49.5 mL of a 4.27%(m/v) Na₂CO₃ solution?

grams of Na₂CO₃

6.For each of the following solutions, calculate the molarity of the solution.

9.87 g MgNH₄PO₄ in 750. mL solution

mol/L

19.1 g NaCH₃COO in 600. mL solution

mol/L

6.64 g CaC₂O₄ in 300. mL solution

mol/L

5.58 g (NH₄)₂SO₄ in 500. mL solution

mol/L

7.Calculate the number of grams of solute in each of the following solutions.

(a) 4.95 L of a 2.44 M HCl solution	grams of HCl
(b) 38.0 mL of a 12.5 M HNO₃ solution	grams of HNO₃
(c) 50.7 mL of a 10.4 M AgNO₃ solution	grams of AgNO₃
(d) 1.77 L of a 6.3Ã10^-3 M Na₂SO₄ solution	grams of Na₂SO₄

8.Calculate the mass-volume percent concentration for a 8.9 M NaOH solution.

9.What is the molarity of the solution prepared by diluting 35.0 mL of 1.25 M AgNO₃ to each of the following final volumes?

69.6 mL

84.9 mL

810 mL

2.57 L

Determine how to make 500 grams of a mixture that is 8% powdered gypsum in sand? in this case since your mixing two solids the units of your expression on the right side of the equals signs will be in gram/gram.

Describe how to make a 50mL of a 10% solution of dextrose (table sugar) in water

If you mix together 5 grams of dextrose and 400 mLs of water, what percent solution would you have made?

Starting with a bottle of Tween, a liquid detergent with a FW of 1227.4 g/mol, describe how you would prepare 0.5 L of a 2 M solution in water.

Starting with a bottle of sodium phosphate, a common buffer used in growth media, which has a FW if 120 g/mol, describe how you would prepare 250 mL of a 0.5 mM solution in water.

If you were to add 60 grams of sodium phosphate to 0.25 L of water, what would the molarity be?

Describe how to make 200mL of a 0.3 M solution of Tris using a 1.0 M Tris stock solution.

Using stocks of 1 M Tris and 500 mM EDTA, describe how to prepare 50 mL of a 100 mM Tris, 5 mM EDTA working solution

CHEM 24112 Chapter Notes - Chapter 15: Potassium Bromide, Volumetric Flask, Sodium Hydroxide

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