Sgoodmacheer Kalvi twelfth Chemistry Ionic Harmony Multiple Additional Concerns

Question 6. 1M CHstep step threeCOOH 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 \(\frac < 0.20>< 0.18>\) = 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 regarding an enthusiastic aqueous service obtained because of the combination six gram out-of acetic acidic and you can 8.dos gram regarding salt acetate and making the volume comparable to 500 ml. (Given: K to have acetic acidic try 8 x ten) Answer: According to Henderson – Hessalbalch picture,

  • the fresh new hydrolysis ongoing,
  • 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

  3. Ag2(CrO4)

Assess the latest pH off 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 this of the adopting the is mostly included in the new fertilizer business? (a) Lactic acidic (b) Sulphuric acidic (c) Tannic acidic (d) Carbonic acid Address: (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 fresh new acidic contained in milk is actually ………….. (a) Lactic acidic (b) Tannic acidic (c) Tartaric acidic (a) Acetic acidic Respond to: (a) Lactic acid

Question 5. Consider the following the comments. (i) Acidic choice bad (ii) Acid transforms red-colored litmus to help you blue (iii) Acidic responds which have gold and silver and liberates hydrogen fuel

Which of the more than declaration try I is actually right? (a) (i) just (b) (i) (ii) (c) (i) (iii) (d) (ii) simply Respond to: (c) (i) (iii)

Question six. Take into account the following the statements. (i) Acid needs bad. (ii) Acid converts bluish litmus so you’re able to yellow (iii) Acid is likely to deal with a good proton from other compounds.

Hence of your own a lot more than statement was I commonly proper? (a) (i) (ii) (b) (ii) (iii) (c) (iii) simply (a) (ii) only 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