A chemistry graduate student is given 250. mL of a 1.50M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with K= 4.9 × 10 10. What mass of NaCN Sshould the student dissolve in the HCN solution to turn it into a buffer with pH = 8.84? You may assume that the volume of the solution doesn't change when the NaCN is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

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Chapter1: Chemical Foundations
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A chemistry graduate student is given 250. mL of a 1.50M hydrocyanic acid
(HCN) solution. Hydrocyanic acid is a weak acid with K,=4.9 × 10 1º. What
mass of NaCN should the student dissolve in the HCN solution to turn it
into a buffer with pH = 8.84?
You may assume that the volume of the solution doesn't change when
the NaCN is dissolved in it. Be sure your answer has a unit symbol, and
round it to 2 significant digits.
?
Transcribed Image Text:A chemistry graduate student is given 250. mL of a 1.50M hydrocyanic acid (HCN) solution. Hydrocyanic acid is a weak acid with K,=4.9 × 10 1º. What mass of NaCN should the student dissolve in the HCN solution to turn it into a buffer with pH = 8.84? You may assume that the volume of the solution doesn't change when the NaCN is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. ?
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