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The [tex]$pH$[/tex] of four different substances is shown below.

\begin{tabular}{|l|l|}
\hline \multicolumn{1}{|c|}{Substance} & [tex]$pH$[/tex] \\
\hline Shampoo & 6 \\
\hline Lemon juice & 2 \\
\hline Tomato juice & 4 \\
\hline Liquid drain cleaner & 14 \\
\hline
\end{tabular}

Which substance is closest to being neutral on the [tex]$pH$[/tex] scale?

A. Shampoo
B. Lemon juice
C. Tomato juice
D. Liquid drain cleaner

Sagot :

GinnyAnswer
To determine which substance is closest to being neutral on the pH scale, we need to compare their pH values to the neutral pH value, which is \(7\). The closer a substance's pH value is to \(7\), the closer it is to being neutral.

Here's the step-by-step process to find the closest substance:

1. Identify the pH values of the substances:
- Shampoo: \(6\)
- Lemon juice: \(2\)
- Tomato juice: \(4\)
- Liquid drain cleaner: \(14\)

2. Calculate the absolute difference between the pH value of each substance and the neutral pH value of \(7\):
- For Shampoo: The difference is \(|6 - 7| = 1\).
- For Lemon juice: The difference is \(|2 - 7| = 5\).
- For Tomato juice: The difference is \(|4 - 7| = 3\).
- For Liquid drain cleaner: The difference is \(|14 - 7| = 7\).

3. Compare these differences to find the smallest one, since the smallest difference will indicate the substance closest to neutral:
- Shampoo: \(1\)
- Lemon juice: \(5\)
- Tomato juice: \(3\)
- Liquid drain cleaner: \(7\)

4. Determine the smallest absolute difference:
- The smallest difference is \(1\), which corresponds to Shampoo.

Therefore, the substance closest to being neutral on the pH scale is Shampoo.

Answer: Shampoo
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