San excellentmacheer Kalvi 1dosth Chemistry Ionic Equilibrium Numerous Additional Concerns

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San excellentmacheer Kalvi 1dosth Chemistry Ionic Equilibrium Numerous 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. Find the pH of a buffer solution containing 0.20 mole per litre sodium acetate and 0.18 mole per litre acetic acid. Ka for acetic acid is 1.8 x 10 -5

Given that Ka = 1.8 x 10 -5 pKa = – 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

Matter 8. What’s the pH out-of an enthusiastic aqueous services obtained by blend 6 gram off acetic acid and you may 8.dos gram out of sodium acetate and you may making the frequency equal to five hundred ml. (Given: K getting acetic acid are 8 x female escort in Savannah GA ten) Answer: Based on Henderson – Hessalbalch picture,

  • new hydrolysis constant,
  • standard of hydrolysis and you will
  • pH of O.1 M CH3COONa solution (pKa 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 pKa = 4.74 pKa = – log Ka i.e., Ka = antilog of ( – PKa) = antilog of ( – 4.74) = antilog of( – 5 + 0.26) 10 -5 x 1.8

  1. BaSO4
  2. Ag2(CrO4)

Assess brand new 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

Concern dos. And that of your own adopting the is certainly caused by utilized in the fresh manure world? (a) Lactic acid (b) Sulphuric acidic (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)

Matter 4. The brand new acid found in milk is ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acid (a) Acetic acidic Respond to: (a) Lactic acid

Matter 5. Check out the following comments. (i) Acid needs bad (ii) Acid turns reddish litmus to help you blue (iii) Acid reacts which have metals and you will liberates hydrogen energy

And that of your own over report are We is actually correct? (a) (i) merely (b) (i) (ii) (c) (i) (iii) (d) (ii) just Address: (c) (i) (iii)

Question 6. Think about the adopting the statements. (i) Acid choices sour. (ii) Acidic turns blue litmus to red-colored (iii) Acid will accept an excellent proton off their ingredients.

And therefore of the more than report is actually We aren’t best? (a) (i) (ii) (b) (ii) (iii) (c) (iii) merely (a) (ii) simply Respond to: (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

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