Question

On addition of `1 mL` solution of `10% NaCl` to `10 Ml` gold sol in the presence of `0.0250 g` of starch, the coagulation is just prevented. What is the gold number of starch?

Answer 1

Amount of starch in `mg` that prevent coagulation by `1mL` of `10%NaCl` solution `=0.025xx1000=25` .
Hence, gold number `=25` .

Answer 2

Amount of starch in `mg` that prevent coagulation by `1mL` of `10%NaCl` solution `=0.025xx1000=25` .
Hence, gold number `=25` .