A find the moles of hydrochloric acid present in 50cm

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(a) Find the moles of hydrochloric acid present in 50cm 3 of solution B Procedure II When the reaction is complete, add 100cm 3 of distilled water to the contents of the flask and shake. Add more distilled water to top the solution to the mark. Label it as solution D. Pipette 25cm 3 of solution D into a 250cm 3 of conical flask and titrate with solution C using 1 to 2drops of phenolphthalein indicator. Record your results in table 1 below. Repeat this procedure to obtain accurate values: (b) Determine the average volume of solution C used (c) (i) Calculate the volume of sodium hydroxide that would react with 250cm 3 of the diluted acid (ii) Calculate the moles of sodium hydroxide solution C in the volume obtained in c(i) Above (d) Write down equation for the reaction between hydrochloric acid and sodium hydroxide 55 I II III Final burette reading (cm 3 ) Initial burette reading (cm 3 ) Volume of solution C used (cm 3 )
(e) How many moles of hydrochloric acid are left after the reaction with the metal carbonate A (f) Calculate the moles of hydrochloric acid that reacted with 1.5g of the metal Carbonate A (g) (i) Write down the ionic equation between carbonate and hydrochloric acid (iii) Calculate moles of carbonate A (iv) Calculate the molar mss of the carbonate A 2. You are provided with:- - 2.0M sulphuric (VI) acid solution, solution Z 56
- 0.42M glucose, solution X - 0.04M potassium manganate (VII) solution Y You are required to determine the rate of reaction between aqueous glucose solution and acidified potassium manganate (VII) at different temperatures. Procedure Place 1cm 3 of solution Y into a conical flask. Using a 100cm 3 measuring cylinder add 25cm 3 of solution Z to the conical flask containing solution Y . Warm the mixture to about 70 o C. Stop warming and allow the mixture to cool. When the temperature is exactly 65 o C add 7.5cm 3 of solution X and start the stop watch immediately. Stir the mixture with a thermometer and measure the time taken for the colour of the mixture to change from purple to colourless. Record the time in table 2 below also record the temperature at which the mixture turns colourless. Clean the conical flask and repeat the procedure at temperature of 60 o C, 55 o C 50 o C and 45 o C instead of 65 o C. (a) Calculate 1/ time and complete the table Table 2 (6mks) Temperature before mixing ( o C) 65 60 55 50 45 Temperature when solution becomes colourless ( o C) Time in seconds 1 / time (s -1 ) (b) Plot a graph of 1 / time (y-axis) against the temperature at the point when the solution becomes Colourless (c) From your graph, determine the time that the reaction would take if the temperature at which the solution becomes colourless is 52.5 o C (d) From your graph, determine the rate of reaction if the temperature at which the solution becomes colourless is 47 o C (d) Explain the shape of your graph 3. You are provided with mixture K . You are required to perform tests on the mixture in order to determine its composition. Record your observations and inferences in their spaces provided:- (a) Place a spatula of K on a white tile and observe its appearance:- Observation Inference 57

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