Category: Interesting Questions

You have read the exam question carefully and decided that the following are the key bits of information: 3.70 g of insoluble MCO3 is added to 250 cm3 of 0.5 mol HNO3. A 20 cm3 sample of the solution is titrated with 19.9 cm3 of 0.3 mol dm-3 NaOH. Calculate the relative atomic mass of M,…

You have £20.00 in your pocket. You go to the shops and buy a few things. When you get home, you have £3.73 left. How much did you spend? You hopefully said £16.27. A back titration is essentially the same as the calculation you’ve just done – by determining how much of something was left…

You have read the exam question carefully and decided that the following are the key bits of information: 1.50 g of impure Na2O reacts and dissolves to make a 150 cm3 solution A 50 cm3 sample is titrated with 13.7 cm3 of 0.5 mol dm-3 HNO3 Determine the % by mass purity of Na2O. Step 1 We…

You have read the exam question carefully and decided that the following are the key bits of information: 3.69 g of Ba(OH)2.xH2O is made into a 250 cm3 solution A 25 cm3 sample of the solution is titrated with 23.4 cm3 of 0.1 mol/dm3 HCl. Calculate the relative formula mass of Ba(OH)2.xH2O, and hence x.…

You have read the exam question carefully and decided that the following are the key bits of information: 3.69 g of soluble M2CO3 is made into a 250 cm3 solution A 25 cm3 sample of the solution is titrated with 26.7 cm3 of 0.2 mol dm-3 HNO3. Calculate the relative atomic mass of M, and hence, identify…

You will meet a very wide variety of titrations on the A Level Chemistry course. Titration calculations can sometimes be quite complex (and worth 6, 7 or 8 marks!) but the basic procedure will always be the same: First, use the data in the question to find the moles of one substance. Then, use the…