Describe one chemical test and one physical test for pure water.
Chemical Test: One common chemical test for pure water is the pH test. Pure water has a pH of 7, which means it is neutral and has an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-) in solution. To perform this test, a small amount of water can be added to a pH indicator solution, such as litmus paper or a pH meter, and the resulting color or numerical reading can be compared to a pH chart to determine the pH of the water.
Physical Test: A physical test for pure water is its boiling point. Pure water has a boiling point of 100 degrees Celsius (212 degrees Fahrenheit) at sea level, which means it will boil and turn into steam at this temperature. To perform this test, water can be heated in a container until it reaches its boiling point, and the temperature can be monitored using a thermometer. If the water boils at exactly 100 degrees Celsius, it indicates that it is pure water without any impurities that can affect its boiling point.
A common chemical test for pure water is the pH test. Pure water has a pH of 7, which means it is neutral. To test the pH of water, litmus paper or a pH meter can be used.
The most commonly used physical test for pure water is the boiling point test. Pure water boils at 100°C at standard pressure. By heating water and measuring its boiling point, it is possible to determine if it is pure or contains impurities.
The pH test is used to test the purity of water because it can indicate the presence of acidic or basic substances that can affect the water’s properties. Pure water has a pH of 7, which means it is neutral and does not contain any acidic or basic substances.
The boiling point of pure water is a physical test used to determine the purity of water. If the boiling point is higher than 100°C, it indicates the presence of impurities, while a lower boiling point indicates the presence of dissolved gases, such as air.
Litmus paper works as a chemical test for pure water by changing color in the presence of acidic or basic substances. Since pure water has a neutral pH of 7, it does not change the color of litmus paper, which remains blue.
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