3 The Reaction Of Sulfuric Acid With Potassium Hydroxide Is A Neutralisation The Equation For This Reaction Is H So Aq 1 (34.48 KiB) Viewed 44 times
3 The Reaction Of Sulfuric Acid With Potassium Hydroxide Is A Neutralisation The Equation For This Reaction Is H So Aq 2 (24.16 KiB) Viewed 44 times
3 The Reaction Of Sulfuric Acid With Potassium Hydroxide Is A Neutralisation The Equation For This Reaction Is H So Aq 3 (24.16 KiB) Viewed 44 times
3 The reaction of sulfuric acid with potassium hydroxide is a neutralisation. The equation for this reaction is H.SO (aq) + 2KOH(aq) → K.SO.(aq) + 2H2O(1) A titration was carried out using the following method. 1. Potassium hydroxide solution of unknown concentration was placed in a burette and the initial reading was recorded. 2. 25.0 cm' of sulfuric acid solution, concentration 0.0800 moldm, was transferred to a conical flask. 3. Three drops of phenolphthalein indicator were added to the sulfuric acid. 4. Potassium hydroxide was added from the burette until the solution just changed colour and then the burette reading was recorded. 5. Repeat titrations were carried out until concordant titres were obtained. (a) Select the most appropriate piece of apparatus to measure the 25.0 cm' of sulfuric acid. A burette B measuring cylinder C pipette ID volumetric flask (b) What is the colour of the solution when neutralisation has just occurred? (1) DA colourless Borange C pale pink OD red
10 ) Complete the table of results for titration number 1, using the diagrams to find the initial and final burette readings (2) 32 เป็น 33 Initial reading Final reading Table of results Final reading/cm Initial reading/cm Titration volume/cm Titration number 1 2 28.05 1.10 26.95 27.45 3 37.65 10.20 4 32.05 5.00 27.05 The best value for the mean titre of this reaction is (1) DA 27.00 cm B 27.15 cm OC 27.25cm OD 27.30 cm
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