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e) i?? 4896 Wed Jul 11 8:44:01 People Window Help xy https://www.stolat eux G kbr chemical-Googl x) owLv2lOnline teach × ?|? , irntakeAssignment/takeCovalentActivity.do?locatorassignment-take&takeAssignm; Use the References to access Important values If needed for this question. Indicate whether each of the following compounds will give an acidic, basic or neutral solution when dissolved in water. Clear All ammonium chloride eThe pll will be less than 7. potassium hypochloriteD The pH will be approximately equal to 7 calcium chloride The pH will be greater than 7 ammonium nitrate Submit Answer Ratry Entire Group 2 more group attemptsr Previous NextExplanation / Answer
Ans. #1. NH4Cl: pH will be less than 7
It is a salt of weak LEWIS base NH3 and strong acid HCl. The anion of strong acid acts as spectator ion, so does not affect the pH of solution. The cation of weak base acts as conjugate acid, donates an H+ water to make the solution acidic as follow-
NH4+(aq) + H2O <-------> NH3(aq) + H3O+(aq)
Therefore, pH < 7
#2. KClO: pH will be greater than 7
It is a salt of strong base KOH and weak acid HClO. The cation of strong base K+ acts as spectator ion and does not affect the pH of solution. The anion of weak acid ClO- acts as conjugate base, accepts a H+ from water and thus makes the solution BASIC as follow-
ClO-(aq) + H2O(l) <----------> HClO(aq) + OH-(aq)
Therefore, pH of a solution of LiF is greater than 7 (Basic, pH > 7).
#3. CaCl2: The pH will be approximately equal to 7
It is a salt of strong acid and strong base. The solution of such a salt is neutral because both the cation and anion act as spectator ions.
So, pH = 7.
#4. NH4NO3: pH will be less than 7
It is a salt of weak base NH4OH and strong acid HNO3. The anion of strong acid acts as spectator ion, so does not affect the pH of solution. The cation of weak base acts as conjugate acid, accepts OH- from water to make the solution acidic (pH < 7).
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