You are testing two different household solutions with your cabbage indicator, one solution turns blue. a possible hydrogen ion concentration for this solution is:

pH 8  

Step-by-step explanation:

Red cabbage contains a compound called anthocyanin.

It produces different colours depending on the pH of the solution.

In the image below, you can see that the cabbage indicator is blue between pH 7 and pH 9, so a possible pH for your solution is pH 8.

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