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

Question 8 escort in New Haven. What’s the pH off a keen aqueous solution gotten by collection six gram out of acetic acidic and you will 8.2 gram off sodium acetate and you may making the volume equivalent to 500 ml. (Given: K for acetic acid is actually 8 x 10) Answer: Predicated on Henderson – Hessalbalch formula,

• the newest hydrolysis ongoing,
• level 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 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

Question dos. Hence of one’s after the is usually found in the newest manure industry? (a) Lactic acidic (b) Sulphuric acid (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 new acid within milk are ………….. (a) Lactic acid (b) Tannic acid (c) Tartaric acidic (a) Acetic acid Answer: (a) Lactic acidic

Question 5. Check out the after the comments. (i) Acidic needs sour (ii) Acid transforms red litmus to blue (iii) Acidic responds having precious metals and you can liberates hydrogen energy

And therefore of a lot more than report was We is right? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) simply Respond to: (c) (i) (iii)

Matter six. Consider the following statements. (i) Acid choice bad. (ii) Acidic converts bluish litmus so you can reddish (iii) Acidic sometimes accept a proton from other substances.

And therefore of the a lot more than declaration are I aren’t correct? (a) (i) (ii) (b) (ii) (iii) (c) (iii) just (a) (ii) simply 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

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