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How many moles of NH, must be added to 1...

How many moles of NH, must be added to 1 litre of 0.75 M `AgNO_3` in order to reduce the `Ag^+` concentration to `5 xx 10^(-8)M? K_b [Ag(NH_3)_7^+] = 1xx 10^(-8)`

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1.9 mole
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