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The acid ionization equilibrium for HNO2 is represented by the equation above. A 250.0mL buffer solution is prepared by mixing 125.0mL of 0.20MHNO2 and 125.0mL of 0.1MNaOH. To test the buffer capacity, the pH is measured and recorded in the table for four samples of the buffer and one sample of a mixture of the buffer and HCl. Which of the following best helps explain why the pH of sample 4 is lower than the pH of the other samples containing only buffer solution?APrior to measuring the pHpH of sample 4, some water evaporated, resulting in an increase in the concentration of HNO2HNO2 in the sample.BAfter measuring the pHpH of the more acidic sample 3, the pHpH probe was not rinsed and wiped, resulting in the neutralization of a very small amount of the conjugate base in sample 4.CPrior to measuring the pHpH of sample 4, the room temperature dropped suddenly, resulting in an increase in the pKapKa for HNO2HNO2.

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