Question

34.
a) What pH do you expect for the following salt solutions and why?
NaCl, CuSO4 , and Na2CO3
b) Alcohol and glucose also contain hydrogen but do not conduct electricity. Why?
OR
a) Why is tartaric acid added into baking soda to get baking powder?
b) Why does tooth decay start when the pH of the mouth is lower than 5.5?
c) How would you say that copper sulphate crystals contain water of crystallisation ?​

Answer 1

Answer:

NaCl is a salt of strong acid (HCl) and a strong base (NaOH). Therefore, its solution is neutral with pH = 7 CuSO4 is a salt of strong acid (H2SO4) and weak base [CU(OH)2]. Therefore, its solution is acidic with pH < 7. Na2CO3 is a salt of strong base (NaOH) and weak acid (H2CO3). Therefore, its solution is basic with pH > 7.