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

Matter 8. What is the pH out of an aqueous service received by combo six gram out of acetic acidic and 8.dos gram off salt acetate and you will making the regularity equivalent to five hundred ml. (Given: K having acetic acidic is actually 8 x ten) Answer: Predicated on Henderson – Hessalbalch picture,

• this new hydrolysis lingering,
• amount of hydrolysis and you may
• 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

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2. Ag₂(CrO₄)

Estimate brand new pH off 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

Question dos. Which of your following is mostly used in the new manure community? (a) Lactic acid (b) Sulphuric acidic (c) Tannic acidic (d) Carbonic-acid Answer: (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)

Concern 4. The latest acidic found in dairy is actually ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acidic (a) Acetic acidic Answer: (a) Lactic acid

Concern 5. Think about the pursuing the statements. (i) Acidic preferences bitter (ii) Acidic turns purple litmus to help you blue (iii) Acidic reacts that have gold and silver coins and you will liberates hydrogen energy

Which of the above declaration are We are best? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) only Answer: (c) (i) (iii)

Concern six. Take into account the adopting the statements. (i) Acidic preferences bad. (ii) Acid turns bluish litmus to help you reddish (iii) Acidic has a tendency to take on a good proton off their compounds.

And that of the more than declaration is We commonly best? (a) (i) (ii) (b) (ii) (iii) (c) (iii) simply (a) (ii) only Respond to: (c) (iii) merely

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

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