How much of what would you use to make 1 liter of 1 M sodium acetate?
Use the crystalline sodium acetate; weigh out 82 grams and dissolve in enough water to make 1 liter.
How much of what would you use to make 100 mL of 2% lactose?
a) 2 grams of solid lactose; q.a. 100 mL with water
b) 50 mL of 4% lactose and add 50 mL of water
How much of what would you use to make 100 mL of 2.5% lactose?
a) 2.5 grams of solid lactose; q.a. 100 mL with water
b) 50 mL of 5% lactose and add 50 mL of water
How much of what would you use to make 100 mL of 8% lactose.
You now have only one option:
8 grams of solid lactose; q.a. 100 mL with water
You need to make some "pond" water to grow you algae on the window sill. How much of what do you use to make 100 mL of 0.1% sodium bicarbonate?
Use 0.1 gram of sodium bicarbonate; q.a. 100 mL with water.
You have added 10 grams of NaCl to 200 mL of water. What is the percent concentration?
10 grams/200 mL is like 5 grams/100 mL; thus 5%
How much solid NaCl do you make up to a liter with water to give you a 0.1M NaCl solution?
58 x 0.1 = 5.8 grams.