San excellent goodmacheer Kalvi twelfth Biochemistry Ionic Harmony Several Additional Questions

Question 6. 1M CH_{step step 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 \(\frac \) = 4.74 + log \(\frac \) = 4.74 + log 10 – log 9 = 4.74 + 1 – 0.95 = 5.74 – 0.95 = 4.79

Question 8. What’s the pH from an aqueous provider gotten by mixing six gram out of acetic acid and you will 8.dos gram of sodium acetate and you will making the regularity comparable to five hundred ml. (Given: K to possess acetic acidic are 8 x 10) Answer: Centered on Henderson – Hessalbalch formula,

• the fresh hydrolysis constant,
• 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)

Estimate the fresh new pH away from 0

Question 1. Which one of the following escort girl South Bend buffer is present in blood? (a) CH₃COOH + CH₃COONa (b) NH₄OH + NH₄Cl (c) H₂CO₃ + NaHCO₃ (d) HCI + NaCl Answer: (c) H₂CO₃ + NaHCO₃

Question dos. And therefore of the pursuing the is mostly utilized in the new fertilizer world? (a) Lactic acid (b) Sulphuric acidic (c) Tannic acidic (d) Carbonic acid Respond to: (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)

Matter cuatro. This new acidic within dairy are ………….. (a) Lactic acid (b) Tannic acidic (c) Tartaric acid (a) Acetic acidic Address: (a) Lactic acidic

Matter 5. Take into account the pursuing the statements. (i) Acid choices sour (ii) Acidic converts red-colored litmus to blue (iii) Acidic reacts which have metals and you may liberates hydrogen gas

And that of significantly more than statement is We is best? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) simply Address: (c) (i) (iii)

Question six. Consider the following statements. (i) Acid tastes sour. (ii) Acid transforms blue litmus so you can purple (iii) Acidic will undertake a good proton from other compounds.

Which of your significantly more than report was I are not correct? (a) (i) (ii) (b) (ii) (iii) (c) (iii) merely (a) (ii) only Answer: (c) (iii) just

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