As2 S3 sol is negatively charged. Between sodium nitrate and aluminium nitrate which one is needed in larger quantity to coagulate the above sol? and why ?
According to Hardy-Schedulz rule more the charge more will be the coagualtion power. That ion is needed in smaller quantity for the coagulation. As the colloid is negatively charged one, we have to see positive ion charge for the coagulation. Aluminium nitrated carry Al3+ charge and sodium nitrate is Na+ charge. So smaller ions are needed in large quantity for the coagulation.