Chemistry Answers

1.    Calculate the pH of a buffer solution consisting of 0.50 M HC₂H₃O₂ and 0.50 M NaC₂H₃O₂ (buffer solution A). K_a of HC₂H₃O₂ = 1.75 x 10^-5.

a.     Calculate the new pH of the buffer solution after adding 0.020 mol HCl to 1.0 L of buffer solution A (5 pts).

b.    Calculate the new pH of the buffer solution after adding 0.020 mol NaOH to 1.0 L of buffer solution A (5 pts).

What volume of 0.100 M K2S solution contains 3.5 g of the solute?

1.Predict whether ΔS is positive or negative for the reaction: N2(g) + O2(g) ⟶ 2NO(g)

2.Which has greater entropy? 1mole of NaCl(s) or 1 mol of HCl(g)

Question 4

(a) You are developing a new colorimetric procedure for determining the glucose content of blood serum. You have chosen the standard Folin-Wu procedure with which to compare your results. From the following two sets of replicate analyses on the same sample, determine whether the variance of your method differs significantly from that of the standard method.

Your Method (mg/L): 127, 125, 123,130,131,126 and 129

Folin-Wu method (mg/L): 130, 128, 131, 129, 127,125

What are lactams? Write the structures of gama -butyrolactam and delta -valerobacteria and give their IUPAC names.

How would you prepare the following? (i) Ethanoid anhydride using ketene (ii) A tertiary alcohol starting from an ester`

An expandable container of oxygen gas has a volume of 12.5mL at a temperature of 26.0°C. What volume will the gas occupy at 54.0°C?