If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content



A student prepares a buffer by combining samples of HCN(aq) and NaCN(aq). A particle view of the buffer solution is shown below. Water molecules and cations are not depicted.
Which of the following is true about the pH of the buffer? (The pKa of HCN is 9.21.)
Choose 1 answer: