Uestion 15 11 Marks Alab Attendant Intended To Prepare 2 00 X 102ml Of 2 00 Mol L Sodium Carbonate Solution He Planne 1 (43.42 KiB) Viewed 22 times
Uestion 15 11 Marks Alab Attendant Intended To Prepare 2 00 X 102ml Of 2 00 Mol L Sodium Carbonate Solution He Planne 2 (14.54 KiB) Viewed 22 times
uestion 15 (11 marks) Alab attendant intended to prepare 2.00 x 102mL of 2.00 mol L sodium carbonate solution. He planned to dissolve 42.4 g of anhydrous sodium carbonate (Na2CO3) powder in 200.0 mL of distilled water. Without his knowledge, he mixed the said mass of sodium carbonate powder with the said volume of 4.50 mol L nitric acid instead of distilled water. The vigorous effervescence observed when both the substances were mixed made him realised about his mistake: 2H*(aq) + Na2CO3(s) 2Na+(aq) + H2O(l) + CO2(g) (a) Circle one of the following substances which was left in excess in the mixture (when no effervescence was observed). Justify your answer with clear calculation. (5 marks) Substance in excess: sodium carbonate nitric acid Calculation: 8 of 11
(b) Calculate the concentration (in mol L ') of the substance in excess from part (a). (4 marks)
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