St-LauD Quiz.Saits and Butrers ourtney Friedrich: Attempt 1 Question 7 (0.5 poin

Question

St-LauD Quiz.Saits and Butrers ourtney Friedrich: Attempt 1 Question 7 (0.5 points) Suppose you add several drops of 0.01 M HCI to a test tube containing a solution of NaH2PO4 mixed with Na2HPO4. This solution is a buffer solution. What would you expect to observe? The pH of the solution should decrease when several drops of 0.01 M HCI are added. The pH of the solution should increase when several drops of 0.01 M HCI are added. The pH of the solution should stay fairly constant when several drops of 0.01 M HCI are added Save 3

Explanation / Answer

7. Since you are adding an acid to a buffer which resist the ph change on addition of acid or base, the ph of the solution remains constant.

6. The ph of deionized water reamins fairly around 7. But when a base I,e NaOH is added to it the concentration of OH- ions increases hence the ph raises and it becomes basic in nature.

5. As mentioned above deionized water ph is around 7 when an acid HCl is added the concentration of H+ ions increases there by the ph decreases hence it becomes acidic in nature.

4. The ph of the salt solutions vary along a long range as these salts are of different types.

Salt of strong acid- weak base: NH4Cl - gives acidic solution ph<7

Salt of strong acid- strong base: NaCl, NaNO3 - gives neutral solution or ph is unchanged.

Salt of weak acid strong base: Na2CO3, Na2HPO4, NaH2PO4- gives basic solutions ph>7

3. Question no2 is required for reference. Its not given.

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