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When 30.00 mL of 0.0843 M NaOH was added to 50.00 mL of 0.1085 M weak...

When 30.00 mL of 0.0843 M NaOH was added to 50.00 mL of 0.1085 M weak acid, the observed pH was 4.89.

a. (1 pt) Calculate the pKa for the weak acid.

b. (2 pts) Calculate the fractions in the form HA and A- at a pH= 6.00. Calculate the fractions in the form HA and A- at a pH = 10.00

c. (1 pt) Draw the fractional composition plot showing both \alpha HA and \alpha A-. Use a ruler or graph paper and clearly label the axes. Your graph should be a minimum size of 4” x 4”. Clearly indicate the pKa and the buffer region on the plot.

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Answer #1

Let the wtok aud (A HA t NaOK ーVolume: ーMolo: Cinihal) 0-1035M 0 0843M 50ml 5 425 mmeles 2-529 mmoks 30 ml m motes Cone (M) x Volum (m) Fina 2.396 mmeks- mole 2 524 maoley Acodin Auid HA 499-s-pka t leg-S29 pka- 4.89- log 0.9333 leka 14.957 2.996 (b) (i) pH 600 HA log HA 445-6-oo = -1.05 -505 10

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