25.0 cm3 of sodium hydroxide solution is tritrated against 0.2 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point. Phenolphthalein is used as an indicator in the above experiment. What will be its colour change at the end point?   From pink to yellow From pink to colourless From yellow to colourless From yellow to pink

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