Question

How many milliliters of 1.5 M stock is needed to make 500 ml of 400 molar KC solution?

a) 0.133 ml
b) 133 ml
c) 0.667 ml
d) 667 ml

Answer 1

To make 500 ml of 0.4 M KC solution, 133 ml of the 1.5 M stock solution is needed.

Step-by-step explanation:

The answer is B) 133 ml

To find the volume of the 1.5 M stock solution needed, we can utilize the equation:

(stock concentration) × (stock volume) = (final concentration) × (final volume)

Plugging in the known values, we have: (1.5 M) × (stock volume) = (0.4 M) × (500 ml)

Solving for the stock volume, we get: stock volume = (0.4 M) × (500 ml) / (1.5 M) = 133 ml

Therefore, 133 ml of the 1.5 M stock solution is needed to make 500 ml of 0.4 M KC solution.