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?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Consider this initial-rate data at a certain temperature for the reaction described by

In pqr m< p=60 m< q= 30 and m