Two separate aqueous solutions are prepared at 25 °C: • Solution X: 0.10 M • Solution…
CHEMISTRY · Single correct · AP · Chemistry · Acids and Bases · Acids and Bases
Problem
Two separate aqueous solutions are prepared at 25 °C:
• Solution X: 0.10 M NaOH
• Solution Y: 0.10 M Ca(OH)2
Which of the following correctly compares the pH values of the two solutions?
(a) Solution Y has a higher pH because Ca(OH)2 releases two hydroxide ions per formula unit.
(b) Both solutions have nearly the same pH since they have the same 0.10M concentration of base.
(c) Solution X has a higher pH because NaOH is completely soluble and fully dissociates, whereas Ca(OH)2 is only sparingly soluble.
(d) Solution X has a lower pH because producing more hydroxide ions drives the pH down.