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 = 5 – 0.26 = 4.74 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

Question 8. What is the pH out-of a keen aqueous service gotten from the mix 6 gram from acetic acid and you may 8.dos gram out of sodium acetate and you can deciding to make the regularity comparable to five-hundred ml. (Given: K getting acetic acid are 8 x 10) Answer: Considering Henderson – Hessalbalch picture,

• the brand new hydrolysis constant,
• standard of hydrolysis and
• 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 fresh pH out-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

Matter dos. Hence of your own following the is mostly found in the fertilizer globe? (a) Lactic acidic (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 4. This new acidic found in milk products are ………….. (a) Lactic acid (b) Tannic acidic (c) Tartaric acid (a) Acetic acidic Answer: (a) Lactic acidic

Concern 5. Consider the after the statements. (i) Acid tastes bitter (ii) Acid transforms purple litmus to help you blue (iii) Acidic reacts which have gold and silver and liberates hydrogen gasoline

And that of your own a lot more than report is I is actually right? (a) (i) just (b) (i) (ii) (c) (i) (iii) (d) (ii) simply Respond to: (c) (i) (iii)

Concern 6. Check out the following statements. (i) Acidic preferences bad. (ii) Acid converts blue litmus in order to purple (iii) Acid tends to take on a beneficial proton off their substances.

Which of your over report is actually I are not proper? (a) (i) (ii) (b) (ii) (iii) (c) (iii) only (a) (ii) just Address: (c) (iii) simply

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 McAllenTX escort 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