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  • Q1:Determine the number of different kinds of protons in each compound a) CH3CH2CH2Cl b) CH3CH(Cl)CH3 c) CH3C(CH3)2CH2CH3 d) CH3CH(CH3)CH(CH3)2 See Answer
  • Q2:16. Predict the multiplicity for each shaded protons in the following compounds a. CH3CH2CCl2CH3 b. CH3CH(CH3)OH c. CH3CH(CH3)CH3 d. CH3CH2COOCH2CH3 See Answer
  • Q3:Q4. This question is about acidic solutions. (a) The acid dissociation constant, Ka, for ethanoic acid is given by the expression [CH₂COO-][H+] [CH₂COOH] Ka -3 The value of K₂ for ethanoic acid is 1.74 x 10-5 mol dm-³ at 25 °C A buffer solution with a pH of 3.87 was prepared using ethanoic acid and sodium ethanoate. In the buffer solution, the concentration of ethanoate ions was 0.136 mol dm¯³ Calculate the concentration of the ethanoic acid in the buffer solution. Give your answer to three significant figures. Concentration of acid - mol dm 3 (b) In a different buffer solution, the concentration of ethanoic acid was 0.260 mol dm-³ and the concentration of ethanoate ions was 0.121 mol dm¯ -3 A 7.00 × 10-3 mol sample of sodium hydroxide was added to 500 cm³ of this buffer solution. Calculate the pH of the buffer solution after the sodium hydroxide was added. Give your answer to two decimal places. (3)/n(C) A buffer solution with a pH of 4.5 is made by dissolving x g of sodium propanoate (C₂H5 COONa) in a solution of propanoic acid. The final volume of the buffer solution is 500 cm³, and the final concentration of the propanoic acid is 0.50 mol dm-3 .The value of K₂= 1.74 × 10-5 mol dm-3 at 25 °CSee Answer
  • Q4:8. A stock glucose standard has a concentration of 100 mg/dL. A 1:50 dilution of the standard is done. What is the concentration of the resulting dilution?See Answer
  • Q5: 5. Which of these particle diagrams represents a sample of pure water? How can you tell? See Answer

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