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Unformatted text preview: Rashel Izro (partner: Anum Ansar) Chem111-124 pH in the UN Focus Questions: Does the pH of a solution depend upon the type of chemical species and how they react with each other? Explain your answer. pH of a solution only depends on [H+]. However, the type of chemical species dissolved in water would affect [H+], by either releasing [H+], or taking [H+] away. Why are making pH plots that represent the reactions of Acids and Bases useful? What do they tell us? Making pH plots that represent the reactions of Acids and Bases is useful. It would inform us the relative concentration of acid and base, the strength of acid/ base, and the equivalent point. Why is the Midpoint important to Chemists? At midpoint of a titration the pH equals pKa and is when the titrated buffer has reached equivalence. Erego from there determining the substance would be possible. How does the pH of a buffer vary with the relative amounts of buffer acid and base present in the solution? pH shouldnt change much in the time the buffer is present, however, if either an acid ora base is added enough it can decrease or increase the pH past the buffering zone. Is the buffer capacity necessarily the same with respect to added acid vs. added base? The buffer capacity will remain the same whether an acid or a base is added but if the buffer is acidic it can take in more base than a neutral or basic buffer and vice versa. Confidence/Error Report: My partner and I went through a lot of procedures to observe acids, bases and their salts. Observations: Section A Section B My partner and I predicted that some of the experiments would lead to the substances having the same pH but not all. The following table shows what it looked like. 0.1M Substances Experimental pH Color # Name Formula Type (acid, basic or neutral) pH found in lab 1 0.10M acetic acid HC 2 H 3 O 2 acid 3.86 2 1.0 M acetic acid HC 2 H 3 O 2 acid 2.71 3 0.5M hydrochloric acid HCl acid 0.30 4 0.1M nitric acid HNO 3 acid 0.77 5 1.0M sodium acetate NaC 2 H 3 O 2 basic 7.85 6 0.1M potassium 0....
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