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  4. Number of chloride ions in 100 mL of 0.01 M HCl solution are

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Q. Number of chloride ions in $100 \,mL$ of $0.01 \,M\,HCl$ solution are

Some Basic Concepts of Chemistry

Solution:

Number of moles of $HCl =$ molarity $\times$ volume in $L$

$=\frac{0.01 \times 100}{1000}=0.001$

1 mole of $HCl$ gives $1 $ mole of $Cl ^{-}$ ions

$\therefore $ Number of $Cl ^{-}$ ions given by $0.001 mol HCl$

$0.001 \times 6.023 \times 10^{23}=6.023 \times 10^{20}$