Question

In this experiment, you will use universal indicator to qualitatively measure ph. The universal indicator in this experiment is a mixture of 4 common indicators allowing for a large ph range to be measured. The following table (also available in your lab manual) describes the individual components of our universal indicator.

Answer 1

The true statements is that the color of the indicator relates to the hydrogen ion concentration of the solution.  

What does the color change tell you about the pH?

If a solution is acidic or basic, it can be measured using the pH scale. The universal indicator is said to be added into a specific solution, the color change therefore shows the estimate of the pH of the solution.

An Acid often makes universal indicator solution to change from green toward red and their solution's pH is one that is below 7 on the pH scale.

Note that pH indicators are said to be weak acids and they show the concentration of H+ (H3O+) ions in a solution through color change.

See options below

Select all of the following statements that are true about the universal indicator used in this experiment

The color of the indicator relates to the hydrogen ion concentration of the solution.

At pH 7 the indicator will be colorless.

The universal indicator (or parts thereof) are in equilibrium and have an associated K value.

The color of the indicator relates to the neutral ion concentration in solution.

The universal indicator is a single chemical compound.

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