Multiple Choice
On the pH scale, what is the typical average pH range for healthy human skin and hair?
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17. Acid and Base Equilibrium
The pH Scale
Multiple Choice
Which of the following aqueous solutions has a pH greater than at ?
A
(aq)
B
(aq)
C
(aq)
D
(aq)
Verified step by step guidance1
Recall that pH is a measure of the hydrogen ion concentration in an aqueous solution, where pH less than 7 indicates an acidic solution, pH equal to 7 indicates a neutral solution, and pH greater than 7 indicates a basic (alkaline) solution.
Identify the nature of each compound in water: NaCl is a neutral salt, HCl is a strong acid, H2SO4 is a strong acid, and NaOH is a strong base.
Understand that strong acids like HCl and H2SO4 dissociate completely in water to produce H+ ions, which lower the pH below 7.
Recognize that NaCl dissociates into Na+ and Cl- ions, neither of which affect the pH significantly, so the solution remains neutral with pH around 7.
Note that NaOH dissociates completely into Na+ and OH- ions, increasing the hydroxide ion concentration and thus raising the pH above 7, making the solution basic.
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