Ionic EquilibriumHard
Question
When 20 mL of M/20 NaOH is added to 10 mL of M/10 HCl, the resulting solution will
Options
A.Turn blue litmus red.
B.Turn phenolpthalein solution pink.
C.Turns methyl orange red.
D.Will have no effect on either red or blue litmus.
Solution
mEq of NaOH = 20× 
= 1
mEq of HCl = 10 ×
= 1
So, salt of SA/SB (NaCl) will be formed which do not hydrolyse and pH = 7. So at pH = 7, litmus has no effect. Since, blue litmus turns red a acidic solution, and red litmus turns blue, a basic solution.
i. Phenolphthalein solution turns pink a basic solution of pH > 7.
ii. Methyl orange turns red a acidic solution of pH < 7.
= 1mEq of HCl = 10 ×
= 1So, salt of SA/SB (NaCl) will be formed which do not hydrolyse and pH = 7. So at pH = 7, litmus has no effect. Since, blue litmus turns red a acidic solution, and red litmus turns blue, a basic solution.
i. Phenolphthalein solution turns pink a basic solution of pH > 7.
ii. Methyl orange turns red a acidic solution of pH < 7.
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