Test made for:

Find the volume (in mL) of 5.0 M HNO₃ required to make 250 mL of 0.30 M solution.
Your answer was: 15

Your description was: Slowly add 15 mL of 5 M HNO3 to 125 mL of water, and bring total volume to 250 mL with thorough mixing. Accepted solution: 250 mL x 0.30 mol/L = 75 m mol HNO₃ x 1/5.0 L/mol = 15 mL. To the correct number of significant figures, 15 mL.

To prepare this solution, add 15 mL of 5.0 M HNO₃ to about 100 mL of water. Add enough water to bring the total volume to 250 mL of solution.

Find the mass in grams of Na₂CO₃•10H₂O required to make 750 mL of 0.20 M solution.

Your answer was: 43

Accepted solution: Mass Na₂CO₃•10H₂O = 750 mL x 1 L/1000 mL x 0.20 mol/L x 286.142 g/mol = 42.9213 g Na₂CO₃•10H₂O

To the correct number of significant figures, 43 g.

The NSF/ACS Doing Chemistry series includes experiments for teaching about water and solutions. Which Doing Chemistry experiment(s) use(s) traditional volumetric measurements.

Your answers were DC-060, Molar Concentration and DC-102, Standardization of Acids and Bases.

The accepted answer is DC-102, Standardization of Acids and Bases.

This page created by computation at 1:26:12 PM on Thursday, October 28, 1999.

Go Next NATS