Question

PLEASE HELP!!! 15 POINTS!!

Answer 1

The molar concentration of the HCl is 0.67 mol/L.

1. Write the balanced chemical equation.

HCl + NaOH ⟶ NaCl + H₂O

2. Calculate the moles of NaOH

$\text{Moles of NaOH} =\text{10 mL NaOH} \times \frac{\text{1 mmol NaOH}}{\text{1 mL NaOH}} = \text{10 mmol NaOH}$

2. Calculate the moles of HCl.

$\text{Moles of HCl} =\text{10 mmol NaOH} \times \frac{\text{1 mmol HCl}}{\text{1 mol NaOH}} = \text{10 mmol HCl}$

3. Calculate the molar concentration of the HCl

$c = \frac{\text{moles}}{\text{litres}} = \frac{\text{10 mmol}}{\text{15 mL}} = \textbf{0.67 mol/L}$