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Topic: why the colour of metyl orange disapears in alkalinity test?  (Read 1243 times)

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Offline danavuia.1987

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why the colour of metyl orange disapears in alkalinity test?
« on: March 07, 2019, 07:04:59 AM »
When i make alkalinity test:100 ml of water, 2-3 drops of metyl orange and HCl  0.1N dropwise, until orange color appears.Then, in 1 minute the water is colorless.
Why?
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