San excellentmacheer Kalvi 1dosth Chemistry Ionic Equilibrium Several Additional Concerns

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 Santa Maria CA escort girls. 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 an aqueous services acquired because of the mixing 6 gram of acetic acid and you will 8.2 gram from sodium acetate and you can deciding to make the volume equivalent to 500 ml. (Given: K for acetic acid is actually 8 x 10) Answer: Centered on Henderson – Hessalbalch picture,

• new hydrolysis ongoing,
• amount 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)

Estimate the fresh 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 2. And therefore of after the is usually included in this new manure business? (a) Lactic acidic (b) Sulphuric acid (c) Tannic acid (d) Carbonic-acid Answer: (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)

Concern cuatro. The newest acidic contained in dairy was ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acidic (a) Acetic acid Address: (a) Lactic acid

Concern 5. Consider the after the statements. (i) Acidic choice sour (ii) Acid turns red litmus to help you blue (iii) Acid responds with precious metals and liberates hydrogen gasoline

Which of your own significantly more than report was I is correct? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) just Respond to: (c) (i) (iii)

Question six. Check out the following the comments. (i) Acidic choice bad. (ii) Acidic transforms bluish litmus so you’re able to purple (iii) Acidic sometimes accept a good proton off their ingredients.

Which of your a lot more than declaration is actually I are not proper? (a) (i) (ii) (b) (ii) (iii) (c) (iii) just (a) (ii) just Answer: (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