

Stoichiometry - Engineering
Q1: With increase in the temperature of pure (distilled) water, itsA pOH decreases and pH increases.
B pOH and pH both 4ecreases.
C pH and pOH both increases.
D pH decreases and pOH increases.
ANS:B - pOH and pH both 4ecreases. As the temperature of pure water increases, the autoionization of water increases as well, leading to changes in both pH and pOH. At 25°C, the pH of pure water is 7, and the pOH is also 7. However, as the temperature increases, the dissociation of water molecules into 𝐻+H+ and 𝑂𝐻−OH− ions increases. Since pH and pOH are the negative logarithms of the hydrogen ion concentration (𝐻+H+) and the hydroxide ion concentration (𝑂𝐻−OH−), respectively, their values change accordingly. Here's what happens:
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