Calculation of Original pH from Final pH after Titration A biochemist has 200 mL of a 0.30 M solution of a weak acid with a pKa of 6.4. She adds 3.0 mL of 4.0 M HCl, which changes the pH to 5.8. What was the pH of the original solution?

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

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