i only need number 2 and 3

(i) Preparation of 100 ml of 0.1M phosphate buffer, pH 7.5, using NaH2PO4 and Na2HPO4 (ii) Preparation of 100 ml of 0.15M acetate buffer, pH 4.1, using 1M acetic acid and IM NaOH. (iii) What will be the pH of buffer (ii) if 5 ml of 1M NaOH is added to that buffer Find out the pH through calculations Phosphate buffer 6.0-8.0 pH 7.0 pka Acetate buffer 3.8-5.9 pH 4.76 pka