Question

How many grams of KI are in 25.0 mL of a 3.0% (m/v) KI solution?

Answer 1

Answer:

0.75 g

Explanation:

Notice that you were given the solution's mass by volume percent concentration, which is defined as mass of solute divided by volume of solution, and multiplied by 100.

In your case, a 3.0% w/v potassium iodide solution will contain 3.0 g of potassium iodide for every 100 mL of solution.

You know that the volume of the sample is four times smaller than this value, so you can say right from the start that it will contain four times less potassium iodide.

25.0mL solution⋅3.0 g KI100mL solution=0.75 g KI

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