Calculate the mass of sodium hydroxide needed to prepare 100 mL of a 0.10 M solution.

Answer 1

Calculate the mass of sodium hydroxide needed to prepare 100 mL of a 0.10 M solution.

Molar mass NaOH ~40 g/mol

100 ml x 1 L / 1000 ml = 0.1 L

0.10 M = 0.10 mols/L

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0.1 L x 0.1 mol/L x 40 g/mol = 0.40 g of NaOH needed

Answer 2

Correct option is

A

1g

Meq​ of NaOH= Volume × Molarity =250×0.1=25

Let's now find how many g of NaOH will be needed to prepare 250 mL of 0.1 M solution

40w​×1000=25

w=1g.

Hence, the correct option is A