San excellentmacheer Kalvi twelfth Chemistry Ionic Balance Multiple Most Concerns

Question 6. 1M CH₃COOH solution. The dissociation constant of acetic acid is 1.8 x 10 -5 . Answer: pH = – log[H + ] For weak acids,

Question 7. Find the pH of a buffer solution containing 0.20 mole per litre sodium acetate and 0.18 mole per litre acetic acid. K_a for acetic acid is 1.8 x 10 -5

Given that K_a = 1.8 x 10 -5 pK_a = – log (1.8 x 10 -5 ) = 5 – log 1.8 = www.datingranking.net/escort-directory/spokane-valley/ 5 – 0.26 = cuatro.74 pH = 4.74 + log \(\frac < 0.20>< 0.18>\) = 4.74 + log \(\frac < 10>< 9>\) = 4.74 + log 10 – log 9 = 4.74 + 1 – 0.95 = 5.74 – 0.95 = 4.79

Matter 8. What’s the pH off an enthusiastic aqueous solution acquired by the collection six gram away from acetic acid and you will 8.dos gram from sodium acetate and you may putting some regularity equivalent to 500 ml. (Given: K to have acetic acidic try 8 x 10) Answer: According to Henderson – Hessalbalch formula,

• the fresh hydrolysis lingering,
• level of hydrolysis and you can
• pH of O.1 M CH3COONa solution (pK_a for CH₃COOH is 4.74).

₃COONa is a salt of weak acid (CH₃COOH) and a strong base (NaOH). Hence, the solutions is alkaline due to hydrolysis. CH₃COO (aq) + H₂O (aq) \(\rightleftharpoons\) CH₃COOH (aq) + OH – (aq) Give that pK_a = 4.74 pK_a = – log K_a i.e., K_a = antilog of ( – PK_a) = antilog of ( – 4.74) = antilog of( – 5 + 0.26) 10 -5 x 1.8

1. BaSO₄
2. Ag₂(CrO₄)

Assess the latest pH of 0

Question 1. Which one of the following buffer is present in blood? (a) CH₃COOH + CH₃COONa (b) NH₄OH + NH₄Cl (c) H₂CO₃ + NaHCO₃ (d) HCI + NaCl Answer: (c) H₂CO₃ + NaHCO₃

Concern dos. And that of one’s following is mainly utilized in the latest fertilizer business? (a) Lactic acid (b) Sulphuric acidic (c) Tannic acid (d) Carbonic acid Respond to: (b) Sulphuric acid

Answer: CH

Question 3. Which of the following is present in an antacid tablet? (a) NaOH (b) Mg(OH)₂ (c) Al(OH)₃ (d) either (b) or (c) Answer: (d) either (b) or (c)

Question cuatro. The latest acidic found in whole milk are ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acidic (a) Acetic acidic Answer: (a) Lactic acidic

Question 5. Take into account the following statements. (i) Acid needs sour (ii) Acidic transforms reddish litmus so you can bluish (iii) Acid responds that have metals and liberates hydrogen energy

Which of your own more than statement was I try proper? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) simply Address: (c) (i) (iii)

Concern 6. Consider the following the statements. (i) Acidic choices sour. (ii) Acid converts blue litmus to help you red-colored (iii) Acid tends to accept a proton from other ingredients.

And this of the significantly more than report was We commonly right? (a) (i) (ii) (b) (ii) (iii) (c) (iii) only (a) (ii) merely Respond to: (c) (iii) just

Question 7. Which of the following can act as an acid as well as a base by Lowry – Bronsted theory? (a) H₂O (b) NH₃ (c) NH₄OH (d) Ca(OH)₂ Answer: (a) H₂O

Question 8. In the reaction HCI + H₂O \(\rightleftharpoons\) H₃O + Cl – which one of the acid-base pair? (a) HCl + H₃O + (b) HCI + CI – (c) H₃O + Cl (d) H₂O + Cl – Answer: (b) HCI + CI –

Question 9. Which of the following is considered Lewis acid? (a) NH₃ (b) BF₃ (c) HF (d) HCl Answer: (b) BF₃

Question 10. Which of the following is considered as Lewis base? (a) BF₃ (b) AICI₃ (c) HCI (d) NH₃ Answer: (d) NH₃