An intense topical application of an aqueous solution of solid alum immediately ceases severe bleedi — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Human blood is fundamentally a highly sensitive colloidal dispersion consisting of strictly negatively charged albuminoid particles. According to the Hardy-Schulze rule, highly positively charged cations like $Al^{3+}$ present in alum immediately neutralize these particles, causing rapid, massive localized coagulation (a rigid physical clot) that perfectly seals the wound.