SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Two science studentsare setting up a science experiment to determine the qualities of an unknownclear liquid. They gather the necessarymaterials to make their tests, including blue litmus paper. Why do they need blue litmus paper?
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Blue litmus paperis used when working with acid to clean up the spills
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To test foracidity, blue litmus paper turns red in the presence of an acid
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Totest for alkalinity, blue litmus paper turns red in the presence of an alkaline
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To test forwater, blue litmus paper dissolves immediately upon contact with water
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Explanation:
Detailed explanation-1: -The main use of litmus is to test whether a solution is acidic or basic, as blue litmus paper turns red under acidic conditions, and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F).
Detailed explanation-2: -When soap is dissolved in water, it turns the solution alkaline. The red litmus turns blue in the solution while the blue litmus remains blue in the soap solution due to its alkaline nature.
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