Questions: Which solution is acidic? (A) H2O + H+ + Cl- (B) H2O + Na+ + OH- (C) Na+ + HCO3-

Transcript text: Which solution is acidic? (A) $\mathrm{H}_{2} \mathrm{O}+\mathrm{H}^{+}+\mathrm{Cl}^{-}$ (B) $\mathrm{H}_{2} \mathrm{O}+\mathrm{Na}^{+}+\mathrm{OH}^{-}$ (C) $\mathrm{Na}^{+}+\mathrm{HCO}_{3}^{-}$

Solution

Solution Steps

Step 1: Analyze the Composition of Each Solution

To determine which solution is acidic, we need to analyze the composition of each option:

Option (A): $\mathrm{H}_{2} \mathrm{O}+\mathrm{H}^{+}+\mathrm{Cl}^{-}$
- This solution contains $\mathrm{H}^{+}$ ions, which are characteristic of acidic solutions.
Option (B): $\mathrm{H}_{2} \mathrm{O}+\mathrm{Na}^{+}+\mathrm{OH}^{-}$
- This solution contains $\mathrm{OH}^{-}$ ions, which are characteristic of basic (alkaline) solutions.
Option (C): $\mathrm{Na}^{+}+\mathrm{HCO}_{3}^{-}$
- This solution contains $\mathrm{HCO}_{3}^{-}$, which can act as a weak acid or a weak base, but in the presence of $\mathrm{Na}^{+}$, it is more likely to be slightly basic.

Step 2: Determine the Nature of Each Solution

Option (A): The presence of $\mathrm{H}^{+}$ ions indicates an acidic solution.
Option (B): The presence of $\mathrm{OH}^{-}$ ions indicates a basic solution.
Option (C): The presence of $\mathrm{HCO}_{3}^{-}$ in combination with $\mathrm{Na}^{+}$ suggests a slightly basic solution.

Step 3: Evaluate the Claim in Option D

Option D claims that all solutions are acidic because they contain hydrogen. However, the presence of hydrogen alone does not determine acidity. The presence of $\mathrm{H}^{+}$ ions specifically indicates acidity.