Question

How many grams of NaOH is needed to make a 0.1 L of 10 mg/ml solution?

Answer 1

The first step to answer this question is to convert the volume of solution needed, that is in liters, to mililiters.

$0.1L\cdot\frac{1000mL}{L}=100mL$

Use the concentration of the solution to find how many mg are present in 100mL of the solution:

$100mL\cdot\frac{10mg}{mL}=1000mg$

Now, convert the amount of mg present in the solution to grams:

$1000mg\cdot\frac{1g}{1000mg}=1g$

It means that 1g of NaOH is needed to prepare 0.1L of a 10mg/mL solution.