Which of the following molecules would not change the pH of an unbuffered solution?ANSWERNaOHHClNaClH2SO4
Question
Which of the following molecules would not change the pH of an unbuffered solution?
- NaOH
- HCl
- NaCl
- H₂SO₄
Solution
The molecule that would not change the pH of an unbuffered solution is NaCl.
Here's why:
-
NaOH is a strong base, which means it dissociates completely in water to form Na+ and OH- ions. The OH- ions increase the pH of the solution, making it more basic.
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HCl is a strong acid, which means it also dissociates completely in water to form H+ and Cl- ions. The H+ ions decrease the pH of the solution, making it more acidic.
-
H2SO4 is a strong acid as well, and it dissociates in water to form 2H+ and SO4^2- ions. The H+ ions, again, decrease the pH of the solution, making it more acidic.
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NaCl, on the other hand, is a salt formed from a strong acid (HCl) and a strong base (NaOH). When it dissolves in water, it forms Na+ and Cl- ions, neither of which react with water to form H+ or OH- ions. Therefore, NaCl does not change the pH of the solution.
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