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START
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10.0mL of 0.164M HCl was pipetted.
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0.1-0.2g of toothpaste sample was added
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Reaction is complete.
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Heat over the hot plate for 5mins. Is CaCO3 completely dissociated?
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Back titrate HCl against NaOH.
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Continue heating till CaCO3 completely dissociated.
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Colour change. Is colour change pink to orange?
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Overshot end point.
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End point is reached.
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