S-O-A-P-Y

Chemistry Level pending

To prepare a solution of $pH=12$ , the amount of $NaOH$ dissolved in one litre of the solution should be how much ?

0.2gL^{-1}

0.3gL^{-1}

0.4gL^{-1}

0.1gL^{-1}

1 solution

Gagan Raj
Apr 5, 2015

$pH=12$

$[H^+]$ $=$ $10^{-12}$ $M$

$or$

$[OH^-]$ $=$ $10^{-2}$ $M$

$So$

$[NaOH]$ $=$ $10^{-2}$ $M$ $=$ $\frac{M}{100}$ $=$ $\frac{40}{100}$ $=$ $0.4gL^{-1}$