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In 1L of a buffer obtained by the combin...

In 1L of a buffer obtained by the combination of HA and NaA, [HA] = 0.075(M) and [NaA] = 0.15(M) . If the ionisation constant of HA is `4xx10^(-4)`, then find the concentration of the `H_3O^+` ions in the buffer.

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`pH=14-pK_b-log([NH_4Cl])/([NH_3])`
`:.9=14-4.74-log([NH_4Cl])/([0.1])`
or `[NH_4Cl]=0.182(M)`
`:.` Amount of `NH_4Cl` to be added in 1L solution
`=0.182xx` molar mass of `NH_4Cl`
`=0.182xx53.5g=9.737g`
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