The addition of precisely of a solution is strictly required to completely coagulate of a standard c — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Flocculation value is defined as the minimum millimoles of electrolyte required to coagulate precisely 1 Litre of sol. Moles of $NaCl = 10\text{ mL} \times 1\text{ M} = 10\text{ mmol}$. Total sol volume $= 200\text{ mL} = 0.2\text{ L}$. Flocculation value $= 10\text{ mmol} / 0.2\text{ L} = 50\text{ mmol/L}$.