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CHEM1011-CHEM1031-CHEM1051-Chemistry 1A (T1 2025)

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Based on this titration curve for a 0.1 M monoprotic weak acid with 0.1 M NaOH, what is the pH at the equivalence point in the titration?

titration curve

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Based on this titration curve for a 0.1 M  weak base with 0.1 M HCl, what is the best indicator for this titration? 

titration curve

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Based on this titration curve for a 0.1 M monoprotic weak acid with 0.1 M NaOH, what is the pKa of the acid?

titration curve

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Which of the following best describes the pH values at points A, B, and C on this titration curve?

titration curve for a weak acid with a strong base

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What is the pH of a buffer solution containing 1.02 mol/L acetic acid and 1.21 mol/L sodium acetate? 

pKa acetic acid = 4.76

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This graph shows measurements of the absorbance of light for solutions containing different concentrations of Fe3+. Select the one statement below which best describes the graph. 

graph

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Of the following equilibria, only ________ will shift to the left in response to a decrease in volume.

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Nitrosyl bromide decomposes according to the following equation:

2NOBr (g) ⇌ 2NO (g) + Br2 (g) 

A sample of NOBr (0.729 mol) was placed in an empty 1.00 L flask. At equilibrium the flask contained 0.154 mol of NOBr. How many moles of Br2 are in the flask at equilibrium?

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How is the reaction quotient used to determine whether a system is at equilibrium?

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For the equilibrium below, K = 0.112 at 700.0 °C. 

SO2 (g) + ½O2 (g) ⇌ SO3 (g)

What is the value of K at this temperature for the following reaction?

2SO3 (g) ⇌ 2SO2 (g) + O2 (g)

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