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Chapter 4: Problem 125

You are given a colorless liquid. Describe three chemical tests you would perform on the liquid to show that it is water.

Short Answer

Expert verified
Three tests that can be performed to confirm the liquid is water are the boiling point test, reactivity test, and pH test. If the liquid boils at 100 degrees Celsius, reacts with sodium to produce hydrogen gas, and has a pH value of 7, it is confirmed to be water.

Step by step solution

01

Boiling Point Test

The first test involves boiling the liquid. Water has a distinctive boiling point at 100 degrees Celsius (212 degrees Fahrenheit) under standard conditions, which can be used to confirm whether the liquid is water. If the liquid boils at this temperature, the first test would suggest that it is indeed water.
02

Reactivity Test

Perform a reactivity test. Water reacts with some metals, like sodium, to produce hydrogen gas. By adding a small piece of sodium to the liquid and observing for the release of gas, it can be concluded that the liquid is water if gas bubbles are observed.
03

pH Test

The third test is a pH test. Pure water has a neutral pH value of 7. By using a pH test strip or pH meter, the pH of the unknown liquid can be measured. If the liquid has a pH of 7, it indicates the liquid could be water.

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