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 \(\frac < 0.20>< 0.18>\) = 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 is the pH regarding an enthusiastic aqueous service gotten from the collection 6 gram away from acetic acidic and you will 8.2 gram away from sodium acetate and putting some volume comparable to five hundred ml. (Given: K to have acetic acidic was 8 x 10) Answer: Predicated on Henderson – Hessalbalch formula,

• the fresh new hydrolysis constant,
• level of hydrolysis and you will
• 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)

Determine the fresh new pH from 0

Question 1. Which one of the following buffer is present in blood https://datingranking.net/escort-directory/san-francisco/? (a) CH₃COOH + CH₃COONa (b) NH₄OH + NH₄Cl (c) H₂CO₃ + NaHCO₃ (d) HCI + NaCl Answer: (c) H₂CO₃ + NaHCO₃

Concern 2. And therefore of following is generally found in the fresh new manure globe? (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 4. Brand new acid present in whole milk try ………….. (a) Lactic acidic (b) Tannic acid (c) Tartaric acid (a) Acetic acid Address: (a) Lactic acid

Question 5. Consider the pursuing the comments. (i) Acidic tastes bad (ii) Acidic turns reddish litmus so you can blue (iii) Acid reacts with precious metals and you can liberates hydrogen gasoline

And this of more than report are We are right? (a) (i) only (b) (i) (ii) (c) (i) (iii) (d) (ii) just Respond to: (c) (i) (iii)

Matter six. Think about the pursuing the comments. (i) Acid preferences sour. (ii) Acid transforms bluish litmus so you’re able to purple (iii) Acidic has a tendency to deal with good proton from other compounds.

And therefore of your above report is We aren’t 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