Question

A 11 mL solution of 0.02 M HCI is titrated with 0.02 M NaOH to give the following titration curve. Determine the key features of this curve. (The titration curve is approximate and may not show all aspects adequately.) 14 12 10 Base Added (mL) 5.5 11 16.5 22 The titration curve has the following features (1) Before any base is added, the pH of the starting solution of 0.02 M HCl is4 (2) When small amounts of base are added, up to about 9 mL, the pH Select.gradually but remains in the Select.region. In this area, the solution contains an excess of H30+ ions (3) At and around the equivalence point, the pH rises dramatically, going from the acidic region to the basic region. At the equivalence point, when [H3o+] - [OH-1, the pH is 40 (4) As more base is added beyond the equivalence point, the pH Select contains an excess of OH ions gradually within the Select region. In this area, the solution Tutorial Supporting Materials Periodic Table Constants and Factors Supplemental Data

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question 2-   rises or falls   

acidic or basic

Question 4) rises or falls

acidic or basic

Answer 1

Answer. 2 when small amount of bases are added, upto 9 ml, the pH rises gradually but remains in the acidic region. In this area, the solution contain an excess of H₃O⁺ ions. because as we add base to acid, H⁺ ions reacts with OH^- of base makes rise in pH.

Answer 4 As more bases added beyond the equivalence point, th pH rises gradually within the basic region. In this region, the solution contains an excess of OH^- ions