Sa greatmacheer Kalvi twelfth Biochemistry Ionic Harmony Multiple More Concerns

Sa greatmacheer Kalvi twelfth Biochemistry Ionic Harmony Multiple More 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 \(\frac < 0.20>< 0.18>\) = 4.74 + log \(\frac < 10>< 9>\) = 4.74 + log 10 – log 9 = 4.74 + 1 – 0.95 = 5.74 – 0.95 = 4.79

Question 8. What’s the pH away from an enthusiastic aqueous services obtained by mix 6 gram of acetic acid and 8.dos gram from sodium acetate and putting some frequency equivalent to 500 ml. (Given: K to have acetic acidic is actually 8 x 10) Answer: Predicated on Henderson – Hessalbalch equation,

  • this new hydrolysis ongoing,
  • amount of hydrolysis and
  • 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 https://datingranking.net/escort-directory/richmond-1/ of( – 5 + 0.26) 10 -5 x 1.8

  1. BaSO4
  2. Ag2(CrO4)

Determine new pH from 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 dos. And that of adopting the is generally utilized in this new fertilizer business? (a) Lactic acid (b) Sulphuric acid (c) Tannic acid (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)

Question cuatro. Brand new acidic found in dairy was ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acidic (a) Acetic acidic Respond to: (a) Lactic acidic

Question 5. Look at the adopting the comments. (i) Acid needs sour (ii) Acid turns yellow litmus so you can bluish (iii) Acidic responds which have gold and silver and liberates hydrogen fuel

Hence of one’s a lot more than report try We are right? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) just Respond to: (c) (i) (iii)

Question six. Take into account the adopting the comments. (i) Acidic choices sour. (ii) Acidic turns blue litmus so you can red (iii) Acidic can deal with a great proton off their substances.

Which of above statement is actually I aren’t right? (a) (i) (ii) (b) (ii) (iii) (c) (iii) just (a) (ii) just Answer: (c) (iii) merely

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