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 = 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

Concern 8. What is the pH off an enthusiastic aqueous provider obtained by combo 6 gram from acetic acid and you may 8.dos gram off sodium acetate and you can putting some regularity comparable to 500 ml. (Given: K to possess acetic acidic is 8 x 10) Answer: Predicated on Henderson – Hessalbalch picture,

• new hydrolysis constant,
• degree 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 https://datingranking.net/escort-directory/killeen/ 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)

Determine the brand new 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

Matter dos. And therefore of your following the is usually utilized in the latest 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)

Matter cuatro. Brand new acidic found in milk is ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acid (a) Acetic acid Respond to: (a) Lactic acid

Matter 5. Think about the pursuing the comments. (i) Acidic tastes bitter (ii) Acid converts purple litmus so you’re able to blue (iii) Acid reacts that have gold and silver coins and you may liberates hydrogen gasoline

And that of one’s more than statement try We is proper? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) only Respond to: (c) (i) (iii)

Concern 6. Check out the pursuing the comments. (i) Acidic needs bad. (ii) Acid converts blue litmus in order to purple (iii) Acid does take on good proton off their ingredients.

And that of your own over declaration try I aren’t best? (a) (i) (ii) (b) (ii) (iii) (c) (iii) only (a) (ii) just Respond to: (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 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