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Concentration of H3 O^(+) of aqueous ba...

Concentration of `H_3 O^(+)` of aqueous barium hydroxide is `5 xx 10^(-9) mol L^(-1)` What is the molar concentration of barium hydroxide ?

Text Solution

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Ionic product of water, `K_w = [H_3 O^(+) ] [OH^(-)] = 1 xx 10^(-14)`
Concentration of hydronium ion,` [H_3 O^(+) ]=5 xx 10^(-9) `
Concentration of hydroxyl ion,
`[OH^(-)] = (K_w)/( [H_3 O^+])=(1 xx 10^(-14))/( 5 xx 10^(-9)) = 2 xx 10^(-6) M`
Hydroxyl ion concentration of base is given as, `[OH^(-) ]=2[Ba(OH)_2 ]`
Concentration of` Ba(OH)_2 = ( 2 xx 10^(-6) )/(2 ) = 10^(-6)` M
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