NY Regents Chemistry Exam June 2022
49 Solution A has a pH value of 2.0 and solution B has a pH value of 4.0. How many times greater is the hydronium ion concentration in solution A than the hydronium ion concentration in solution B?
(1) 10
(2) 2
(3) 100
(4) 4
Explanation: As the pH increases, the concentration of H+ or H3O+ (hydronium ion) decreases and the concentration of OH- (hydroxide ion) increases (solution is becoming more basic and less acidic). How much does the concentration change? Each pH unit is equal to a factor of 10. Going from 2.0 to 4.0 is two units, which would lead to a 10*10= 100 factor.
Answer: 3
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