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