Question 6. 1M CH_{step three}COOH solution. The dissociation constant of acetic acid is 1.8 x 10 -5 . Hayward CA live escort reviews 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’s the pH away from an enthusiastic aqueous services acquired from the collection 6 gram off acetic acid and you may 8.2 gram of salt acetate and making the volume equivalent to five hundred ml. (Given: K to possess acetic acidic try 8 x ten) Answer: Predicated on Henderson – Hessalbalch picture,

• the newest hydrolysis ongoing,
• degree 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)

Calculate the latest 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

Matter 2. And that of the after the is certainly caused by found in the manure community? (a) Lactic acid (b) Sulphuric acidic (c) Tannic acidic (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)

Question cuatro. The fresh acid found in milk is actually ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acid (a) Acetic acid Respond to: (a) Lactic acid

Matter 5. Think about the following statements. (i) Acid choice bad (ii) Acidic transforms yellow litmus so you’re able to blue (iii) Acidic responds having metals and liberates hydrogen energy

Which of more than declaration are We are right? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) just Address: (c) (i) (iii)

Concern six. Consider the after the comments. (i) Acidic preferences sour. (ii) Acidic transforms bluish litmus to reddish (iii) Acid tends to undertake an excellent proton off their substances.

And this of one’s significantly more than statement try I commonly right? (a) (i) (ii) (b) (ii) (iii) (c) (iii) simply (a) (ii) simply Respond to: (c) (iii) simply

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