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Questions  >>  SAT  >>  Chemistry  >>  chemical equilibrium
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Q)

Number of $H^{+ ions}$ present in 500 ml of lemon juice of $P^{H}=3$ is

$\begin{array}{1 1} (a)\;6.5 \times 10^{-12} \\(b)\;5.65 \times 10^{-23} \\ (c)\;3.01 \times 10^{20} \\ (d)\;1.506 \times 10^{-20} \end{array} $

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A)
Solution :
$P^H= 3 means [H^+]=10^{-3}M$
100 ml juice contanis $10^{-3}\;mole \;H^{+}$ ions
$\qquad= 10^{-3} \times 6.022 \times 10^{23}$in 1000 ml
$\therefore$ 500 ml juice contains $H^{+}$ ions $=\large\frac{10^{-3} \times 6.022 \times 10^{23} \times 500}{1000}$
$\qquad= 3.102 \times 10^{20}$
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