Sa beneficialmacheer Kalvi 1dosth Chemistry Ionic Equilibrium Numerous Even more Issues

Question 6. 1M CH_{step three}COOH 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

Concern 8. What’s the pH out of an enthusiastic aqueous service obtained of the blend 6 gram from acetic acid and you may 8.2 gram of sodium acetate and you may making the frequency equal to 500 ml. (Given: K having acetic acid is 8 x 10) Answer: Centered on Henderson – Hessalbalch picture,

• the brand new hydrolysis constant,
• degree 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)

Calculate 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

Matter dos. And that of your pursuing the is usually used in brand new fertilizer industry? (a) Lactic acidic (b) Sulphuric acid (c) Tannic acid (d) Carbonic-acid Address: (b) Sulphuric acidic

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. The latest acid present in milk are ………….. (a) Lactic acid (b) Tannic acidic (c) Tartaric acid (a) Acetic acidic Address: (a) Lactic acidic

Matter 5. Consider the after the comments. (i) Acidic preferences sour (ii) Acid transforms red-colored litmus in order to blue (iii) Acid reacts which have gold and silver coins and liberates hydrogen energy

And that of one’s over report try I was proper? (a) (i) simply (b) (i) (ii) (c) (i) (iii) (d) (ii) simply Respond to: (c) (i) (iii)

Matter six. Consider the after the comments. (i) Acidic choice sour. (ii) Acidic converts bluish litmus to help you purple (iii) Acidic has a tendency to deal with an excellent proton from other ingredients.

And this of your over report is actually We commonly right? (a) (i) (ii) (b) (ii) (iii) escort in Montgomery (c) (iii) simply (a) (ii) only Address: (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

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