1.

When 1.0 xx 10^(-5) mg of a protective colloid is added to 20 ml of standard gold sol, the precipitation of gold sol was prevented by adding 5 ml of 10% solution of NaCl. If the gold number of protective colloid is 2.0 x 10^(-x) mg then x is = __?

Answer»


SOLUTION :`20 rarr 1 xx 10^(-5) MG , 10 ml rarr ? `
`(10^(-5) xx 10)/(20) = 0.5 xx 10^(-5) , 5 ml to 0.5 xx 10^(-5) , 1 rarr ? , 0.1 xx 10^(-5) = 1 xx 10^(-6)`.


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