San excellentmacheer Kalvi 1dosth Chemistry Ionic Harmony Multiple Extra Questions

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 = 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’s the pH from a keen aqueous services acquired of the blend six gram out of acetic acidic and you will 8.dos gram out of salt acetate and you can deciding to make the frequency equal to five hundred ml. (Given: K for acetic acid is actually 8 x ten) Answer: Considering Henderson – Hessalbalch picture,

• the fresh new 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)

Determine the new pH regarding 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 this of your own adopting the is usually used in the latest fertilizer 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)

Question 4. The latest acid found in milk are ………….. (a) Lactic acidic (b) Tannic acidic (c) Tartaric acid (a) Acetic acid Answer: (a) Lactic acid

Question 5. Take into account the following statements. (i) Acid preferences bitter (ii) Acid transforms purple litmus to help you blue (iii) Acid reacts which have gold and silver coins and liberates hydrogen energy

And therefore of one’s over statement try I try best? (a) (i) merely (b) (i) (ii) (c) (i) (iii) (d) (ii) only Answer: (c) (i) (iii)

Concern 6. Take into account the adopting the comments. (i) Acid needs bitter. (ii) Acidic turns blue litmus to help you red (iii) Acidic tends to take on a great proton from other ingredients.

Which of your own over statement is We aren’t right? (a) (i) (ii) (b) (ii) (iii) (c) (iii) merely (a) (ii) merely escort service Murfreesboro Respond to: (c) (iii) only

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