1) Calculate the molarity of each of the following solutions. Part A 0.30 mol of

Question

1)

Calculate the molarity of each of the following solutions.

Part A

0.30 mol of LiNO3 in 6.32 L of solution

Express your answer using two significant figures.

Part B

71.8 g C2H6O in 2.50 L of solution

Express your answer using three significant figures.

Part C

11.79 mg KI in 100.7 mL of solution

Express your answer using four significant figures.

2)

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 1.20 M ?

Express your answer to three significant figures and include the appropriate units.

3)What is the molarity of Cl in each solution?

Part A

0.250 M NaCl.

Express your answer with the appropriate units.

Part B

0.110 M SrCl2.

Express your answer with the appropriate units.

Part C

5.00×102M AlCl3.

Express your answer with the appropriate units.

4)A chemist wants to make 6.0 L of a 0.330 MCaCl2 solution.

What mass of CaCl2 (in g) should the chemist use?

Express your answer using two significant figures.

5)

To what volume should you dilute 30 mL of a 10 M H2SO4 solution to obtain a 0.17 M H2SO4 solution?

Express your answer using two significant figures.

6)

What is the net ionic equation of the reaction of MgSO4 with Ba(NO3)2?

Express you answer as a chemical equation including phases.

7) Part A

Enter the complete ionic equation to show the reaction of aqueous lead(II) nitrate with aqueous potassium sulfate to form solid lead(II) sulfate and aqueous potassium nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Part B

Enter the net ionic equation to show the reaction of aqueous lead(II) nitrate with aqueous potassium sulfate to form solid lead(II) sulfate and aqueous potassium nitrate.

Express your answer as a chemical equation. Identify all of the phases in your answer.

8)

Part A

Write balanced molecular equation for the reaction between nitric acid and calcium hydroxide.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Part B

Write net ionic equation for the reaction between nitric acid and calcium hydroxide.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Explanation / Answer

1)Part A

0.30 mol of LiNO3 in 6.32 L of solution

Molarity = No.of moles per Litre solution= No. of moles/Litre

              = 0.3/6.32 = 0.05 M

Part B

71.8 g C2H6O in 2.50 L of solution

No.of moles= 71.8 g/ 46.068 g/mole = 1.5585

Molarity = 1.5585/2.5 = 0.623M

Part C

11.79 mg KI in 100.7 mL of solution

No.of moles= 0.01179 g/166g/mole = 7.1024 x 10-5

Molarity = 7.1024 x 10-5 moles/ 0.1007 L = 0.7053 x 10-3 M

2) A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 1.20 M ?

1.20 M of Na+ = (w/23)/0.4 L

w = 1.2x0.4x23 = 11.04 g

No.of moles = 11.04/23 =0.48 moles

One mole of Na3PO4 will gives us three moles of Na+

Hence for 0.48 moles of Na+, required Na3PO4 = 0.48/3 =0.16 moles

Weight of Na3PO4 = 0.16x163.94 =26.23 g

Express your answer to three significant figures and include the appropriate units.

3) What is the molarity of Cl in each solution?

Part A

0.250 M NaCl.

Same 0.250 M

Part B

0.110 M SrCl2.

0.220M Cl-

Part C

0.15 M Cl-

4)A chemist wants to make 6.0 L of a 0.330 MCaCl2 solution.

What mass of CaCl2 (in g) should the chemist use?

M= (w/110.98) / 6

w = 0.33 x 110.98 x 6 = 219.74 g

5)To what volume should you dilute 30 mL of a 10 M H2SO4 solution to obtain a 0.17 M H2SO4 solution?

Express your answer using two significant figures.

M1V1/n1 = M2V2/n2

(10 x 30)/2 =( 0.17 xV)/2

V = 300/0.17 = 1.76 L

6)What is the net ionic equation of the reaction of MgSO4 with Ba(NO3)2?

MgSO4(aq) + Ba(NO3)2(aq) ---> Mg(NO3)2(aq) + BaSO4(s)

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.