Imagine you have two unlabeled solutions, one is acidic and the other is basic. Without tasting them, describe two different ways you could try to identify which one is which using simple materials available at home.
Without tasting (as it's dangerous), I could identify the solutions using these two ways: \begin{itemize} \item \textbf{Using Litmus Paper:} I would dip a piece of red litmus paper into both solutions. The solution that turns the red litmus paper blue is basic. The solution that does not change the colour of red litmus (or turns blue litmus red, if available) is acidic. \item \textbf{Using Turmeric Paste/Paper:} I would apply a drop of each solution onto a turmeric paste or turmeric paper. The solution that turns the yellow turmeric to a reddish-brown colour is basic. The solution that keeps the turmeric yellow is acidic. \end{itemize}
Explanation
Grading Rubric: 1. Suggests two distinct and appropriate home-based indicators (e.g., litmus, turmeric, China rose). 2. Correctly describes the colour change for the basic solution with each chosen indicator. 3. Correctly describes the colour change/no change for the acidic solution with each chosen indicator. 4. Explicitly states the warning against tasting.