how do I calculate the PH change and determine if its buffer or not? Q4 and Q5 A
ID: 1028559 • Letter: H
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how do I calculate the PH change and determine if its buffer or not? Q4 and Q5 And if the solution show little to no changes why?
Acids, Bases, pll, and Buffers C. Effect of Buffers on pH C.1 Effect of adding acid 5. Buffer 9 olto1. Initial 2. pH after 3. pH after 4. pH yes or no change 5 drops of HCI 10 drops of HCI pH 0.1 M NaCI L High pH buffer Low pH 0 22 /0.25 10.20 C.2 Effect of adding base Solution 1. Initi al 2. pH after 3. pH after 4. pH pH 5. Buffer yes 10 drops change or no? 5 drops of NaOH of NaOH 0.1 M NaCl High pH buffer Low pH Questions and Problems 4 Which solution(s) showed the greatest change in pH? Why? Q5 Which solutions(s) showed little or no change in pH? Why?Explanation / Answer
pH change is initial pH - final pH of solution
First two solutions H3O+ and NaCl are not buffers as change is pH is high. Buffers show no or minimal change in pH (as solution 3 and 4 in both tables).
A buffer is a solution which resist any change in pH by the addition of acid or base
Looking at the above shown data,
4. H3O+ and NaCl solution showed greatest change in pH among all the solutions. This is because the added acid or base completely dissciate in solution and they generate either H+ (in acid) or OH- (in base). This thus lowers or raises the pH of the solution. No neutralizer for acid or base added are present (as in buffer) for these solutions.
5. As can be seen in both the tables, high pH and low pH buffers showed minimal change in pH upon addition of acid or base to the solution. Therefore, the two act as buffer and they are strong buffers such that the concentration of acid and base component in the buffer is high that helps keep pH almost same when addiitonal acid or base are added to the system.
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