30. Solution to Chemistry Problem

16. Determine the coagulation threshold Ck of As2S3 sol with a volume of V3 = 10-5 m3 under the action of:
a) 1.2*10-6 m3 of NaCl solution with a concentration of 0.5 kmol/m3;
b) 0.4*10-6 m3 of MgCl2 solution with a concentration of 0.036 kmol/m3,
c) 0.1*10-6 m3 of AlCl3 solution with a concentration of 0.01 kmol/m3.
Check the validity of the first Schulze-Hardy rule and determine the sign of the charge of the sol particles.