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Question

a scientist makes an acid solution by adding drops of acid to 1.2 L of water. the final volume of the acid solution is 1.202 L, assuming the volume is each drop is 0.05 mL, how many drops were added to the water? what percent of the acid solution is acid?

Answer 1

First subtract the beginning volume from the final volume to get the total volume of acid added:

1.202L - 1.200L = 0.002 L. Convert liters to milliliters 1000mL/1L x 0.002 L = 2 mL. As each drop of acid is 0.05 mL, the number of drops is 1drop/0.05mL x 2 mL = 40 drops. The percent of acid in the final solution is 2 mL/1202. x 100 = 0.16%.

Answer 2

0.002 L was added

2 mL was added

2 mL / 0.05 mL = ?