Chem Labs

INVESTIGATION 15.4: BUFFERS Background Information Please refer to pages 484-486 in the Nelson interpersonal chemistry textbook. Problem What effect does the addition of irates and fundaments shit on a buffer? Prediction According the basis information, acetic acid depart act as a buffer and impart prevent any drastic spay in pH. Water, on the other hand, is unbuffered and therefore its pH will depart pro rata to the volume of acid or base added. Materials Ø         pH measuring Ø         acetic acid firmness of shoot for Ø         distilled water Ø         beakers Ø         hydrochloric acid re reply Ø         sodium hydroxide solution Procedure 1.         Prepare a 0.10mol/L buffer solution using acetic acid. design 50mL of this solution. 2.          agree a maintain step of sodium hydroxide solution and keep up changes. 3.         Add a mo derate quantity of hydrochloric acid solution and observe changes. 4.         Repeat steps dickens and three with 50mL and use results as a control. Evidence judge         Initial pH         PH after addition of NaOH(aq)         PH after addition of HCl(aq) soften         4.75         4.75         4.75 Water         6.40         9.

10         N/A Analysis It was sight that the buffer experienced no noteworthy pH change after the addition of strong acids and bases. The side by side(p) equations rationalize the results. Na+(aq! ), OH-(aq) (SB), CH3COOH(aq) (SA), CH3COO-(aq), H2O(l) OH-(aq) + CH3COOH(aq) à H2O(l) + CH3COO-(aq) H3O+(aq), Cl-(aq), CH3COOH(aq), CH3COO-(aq), H2O(l) H3O+(aq) + CH3COOH(aq) à H2O(l) + CH3COOH(aq) Evaluation This experiment can be considered commensurate for answering the problem. Little could have been confuse in this probes procedure. In the future, other buffers could be experimented with. Furthermore, substances used could be measure more precisely. If you want to get a enough essay, order it on our website: BestEssayCheap.com

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