Question

NaOH (aq) + HCl(aq) H2O + NaCl (aq)

If 25.0 mL of a 0.2 M NaOH solution is used for the reaction
shown above, how many moles of NaOH were involved in the
reaction? _moles.

Answer 1

The answer to your question is 0.005

Step-by-step explanation:

Data

Volume of NaOH = 25 ml

[NaOH] = 0.2 M

moles of NaOH = ?

To solve this problem is not necessary to have the chemical reaction. Just use the formula of Molarity and solve it for moles.

Formula

Molarity = moles / volume

-Solve for moles

moles = Molarity x volume

-Convert volume to liters

1000 ml ---------------- 1 l

25 ml ---------------- x

x = (25 x 1) / 1000

x = 0.025 l

-Substitution

moles = 0.2 x 0.025

-Result

moles = 0.005