Question

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Explanation:

Identify the pH of the tested substance

The problem states that Robyn tests the pH of a liquid using hydrion paper, and the paper appears to have a pH equal to 6. Therefore, the pH of the substance is 6.

Analyze the pH indicator chart for litmus

We look at the provided "pH Indicator Colors" chart to find the row labeled "litmus" (the second row from the top of the indicator bars).

• For pH values from 1 to 6, the litmus bar is colored red/pink.
• At pH 7 and above (from 7 to 14), the litmus bar transitions and is colored blue.

Determine the color of litmus at pH 6

Since the substance has a pH of 6, we locate 6 on the horizontal pH scale at the top of the chart and look down to the "litmus" row. At pH 6, the litmus indicator is in the red/pink region.

Match with the given multiple-choice options

The available options are:

• pink
• orange
• light green
• blue

Since pH 6 lies in the red/pink region of the litmus indicator, the correct option is "pink".

Answer:

• pink (Correct answer)
• orange
• light green
• blue