Question

CHM 130LL Experiment 12 Name: Class number: PRELAB ASSIGNMENT 1. Define the following terms. a) acid b) base: c) pH: d) neutralization: 2. Which of the following is the most acidic solution? i) solution with pH = 7.0 ii) solution with pH - 11.6 ii) solution with pH 5.5 iv) solution with pH = 2.0 3. Which of the following pH indicators will not be used during the experiment? i) methyl red ii) thymol blue ii) phenolphthalein iv) red cabbage solution 4. A small amount of acid is added to a buffer solution with pH = 4.5. What would happen to the pH value of the buffer solution? SSSSSSSSSSS3333333 5. Which of the following compound will form an acid when reacting with water? i) iron(II) oxide iii) sodium chloride ii) sulfur dioxide iv) magnesium oxide 6. Which of the following will change the color of the red litmus paper to blue? i) KOHA iii) HCK) ii) NaClag) iv) Cu(NO) 147

Answer 1

Ans. 1) a) Acid Kred blue la by Bose Base BORD ey pH. I 11 Had Acids are those substance which twens. blue litmus to red and have a pH less thant.. se; Bases are those subs, which twens reed. etrus to blue & have pH 77. PH & It is a measwell as hydungen ion concentration ! 1 pH = -log CH + ]. At asoc acids are those subs. which has pH 4 7 & boses lame pH > 7. range of pH changes with temperatwel. dr Neutralisation - When acid & bost beacts then Salt & watch is foumed, which is known as neutralisation. ns. 2) hessen the pH now acidic is the solution. ivy pre = 2.0 Ans. 4) There is a slight changelvery small change) o in pH value o Ans. 5) 50₂ + H20 - H.S0₂ Ang.6) basic solution twens toch ta litmus paper to blue. til koH = K Engst Of cag) Ans. 3) Red cabbage does not use as a pH indicator & because it does not have a fix range of pH. It show and wlowe when an acid is used as when a boss is added to it remains neutral. while other options has fix pH rangl. Methyl eeld - 4.2-6.3 Thymol blu - 801-906 (Bose) Phenolphthalin - 8.0-9.8 . 1.2-2.8 locid)