Question

How many grams ofNaOH are needed toprepare 275 mL of1.2 M solution?

Answer 1

The first step we have foolow is to convert mL to L and multiply it by the molarity of the solution:

`275mL\cdot(1L)/(1000mL)\cdot(1.2mol)/(L){}=0.33mol`

Use molar mass of NaOH to find the mass of NaOH is:

`0.33mol\cdot(40gNaOH)/(mol)=13.33gNaOH`

It means that the correct answer is 13 grams.