Fill in the blanks by using the correct word/term given in the brackets.
An indictor changes its ________ with change of the nature of the solution. (colour/mass)

Explanation

To fill in the blank in the statement "An indicator changes its ________ with change of the nature of the solution," we need to analyze the options provided: "colour" and "mass."

1. **Understanding Indicators**: Indicators are substances that change their physical properties in response to changes in the chemical environment, particularly pH levels. They are commonly used in titrations and other chemical analyses to determine whether a solution is acidic, basic, or neutral.

2. **Analyzing the Options**:
- **Colour**: Indicators are known for their ability to change color when they come into contact with different types of solutions. For example, phenolphthalein turns pink in basic solutions and remains colorless in acidic solutions.
- **Mass**: The mass of an indicator does not change when it interacts with a solution. Instead, it is the color that changes based on the acidity or basicity of the solution.

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