Is ZnCl2 acidic basic or neutral dissolved in water

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To tell if ZnCl2 (Zinc chloride) forms an acidic, basic (alkaline), or neutral solution we can use these three simple rules along with the neutralization reaction that formed ZnCl2 . • First we need to figure out the acid and base that were neutralized to form Zinc chloride. The equation for ZnCl2 is: • HCl + Zn(OH)2 = ZnCl2 + H2O • It is also useful to have memorized the common strong acids and bases to determine whether ZnCl2 acts as an acid or base in water (or if it forms a neutral solution). • Strong acids: HCl, H2SO4, HNO3, HBr, HI, HClO4 • Weak acids: HF, CH3COOH, H2CO3, H3PO4, HNO2, H2SO3 • Strong Bases: LiOH, NaOH, KOH, Ca(OH)2, Sr(OH)2, Ba(OH)2 • Weak Bases: NH3, NH4OH • Note that we are talking about whether ZnCl2 is an acid, base, or neutral when dissolved in water. • • Salts of strong bases and strong acids: pH will remain neutral at 7. • Salts of weak bases and strong acids: pH less than 7 (acidic). • Salts from strong bases and weak acids: pH greater than 7 (alkaline). • Based on these rules, the solution of ZnCl2 dissolved in water is acidic. • For polyprotic acids (e.g. H3PO4) it’s a bit more complicated and we need to use Ka and Kb to determine the pH of the resulting solution. • More chemistry help at http://www.Breslyn.org.

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