Ա Q4.2: A sodium hydroxide solution was standardised by titrating 0.8592 g of primary standard potassium hydrogen phthal

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Ա Q4.2: A sodium hydroxide solution was standardised by titrating 0.8592 g of primary standard potassium hydrogen phthal

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Ա Q4.2: A sodium hydroxide solution was standardised by titrating 0.8592 g of primary standard potassium hydrogen phthalate (CsHsO4K, RMM = 204.23) to the phenolphthalein end point, requiring 32.67 cm?. Calculate the molarity of the NaOH solution. Q4.3. An aqueous solution of iodine (25 cm', unknown concentration) was titrated against standardised sodium thiosulphate (0.1026 M, 11.26 cm) solution to the starch end point. Calculate the iodine concentration, expressing the answer in gl. and ppm. 12 (s) + 2 S2O32- == S4062 + 21
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