Question

Sa se calculeze pH-ul unei solutii de acid clorhidric ce contine 1,825 g de acid la 500 ml solutie

Answer 1

transformam masa de acid in moli:
$M_{HCl}$=1+35,5=36,5g/mol

n=$\frac{m}{M}$=$\frac{1,825g}{36,5 \frac{g}{mol} }$=0,05moli HCl

Cm=$\frac{n}{V_{s}}$=$\frac{0,05moli}{0,5L}$=0,1M

pH=-lg(Cm)=-lg(0,1)=-lg(10⁻¹)=lg10=1