SASS Chem Salts Preparation Summary

PREPARATION OF SALTS : A WALKTHROUGH B 5JUSBUJPO BR41"TBMUT C "#$.NFUIPE BROPO41"TBMUT D 1SFDJQJUBUJPO JOTPMVCMFTPMJET (a) Titration ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ 2 5070/41/O/N/12© UCLES 2012 For Examiner’s Use 1 The following apparatus is found in a laboratory. ABC 25 cm3 100 50 0 10 20 30 40 50 DEF Write the letter of the apparatus most suitable for the purpose in the table below. purpose apparatus (a) removing 25.0 cm3 of a liquid from a container (b) measuring about 60 cm3 of a liquid (c) as a titrating flask (d) to separate a precipitate from a solution [Total: 4] www.maxpapers.com 2 5070/42/M/J/20© UCLES 2020 1 Iron tablets are used to treat iron deficiency in the body. Iron tablets contain iron(II) ions, Fe2+. A student does a series of titrations with aqueous potassium manganate(VII), KMnO4, to determine the percentage of iron in some iron tablets. Diagrams of some of the apparatus the student uses are shown. A B C 25 cm3 10 1 2 3 4 5 6 7 8 9 (a) Name the three pieces of apparatus. A ............................................................................................................................................... B ............................................................................................................................................... C ............................................................................................................................................... [3] (b) The student: • records the total mass of five iron tablets • crushes the tablets, dissolves them in distilled water and makes the solution up to 250 cm3 • uses apparatus C to transfer 25.0 cm3 of the solution of Fe2+ ions into a conical flask • uses apparatus B to add 10.0 cm3 of dilute sulfuric acid to the conical flask • fills apparatus A with 0.00500 mol / dm3 KMnO4(aq) • titrates the solution of Fe2+ with the 0.00500 mol / dm3 KMnO4(aq) until the first permanent pink colour is seen in the conical flask • repeats the titration three times. 6 Do not write outside the box (06) G/K93725/Jun13/CH3HP 3 In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. A student used the equipment shown to do a titration. Burette White tile Conical flask Acid Pipette Sodium hydroxide Pipette filler Indicator Describe how a student should use this equipment to find the volume of sodium hydroxide solution that reacts with a known volume of acid. Include any measurements the student should make. Do not describe how to do any calculations. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ pipette filler 25.0 cm3pipette alkali solution 2 5070/42/O/N/11© UCLES 2011 For Examiner’s Use 1 10 20 30 40 50 ABC (a) Which of the above apparatus A, B or C, is used for measuring out a fixed volume of liquid for a titration experiment? ..................................................................................................................................... [1] (b) Name this apparatus. ..................................................................................................................................... [1] [Total: 2] 2 5070/42/M/J/20 © UCLES 2020 1 Iron tablets are used to treat iron deficiency in the body. Iron tablets contain iron( II) ions, Fe2+. A student does a series of titrations with aqueous potassium manganate( VII), KMnO 4, to determine the percentage of iron in some iron tablets. Diagrams of some of the apparatus the student uses are shown. A B C 25 cm 3 10 1 2 3 4 5 6 7 8 9 (a) Name the three pieces of apparatus. A ............................................................................................................................................... B ............................................................................................................................................... C ............................................................................................................................................... [3] (b) The student: • records the total mass of five iron tablets• crushes the tablets, dissolves them in distilled water and makes the solution up to 250 cm3 • uses apparatus C to transfer 25.0 cm3 of the solution of Fe 2+ ions into a conical flask • uses apparatus B to add 10.0 cm3 of dilute sulfuric acid to the conical flask • fills apparatus A with 0.00500 mol / dm3 KMnO 4(aq) • titrates the solution of Fe 2+ with the 0.00500 mol / dm3 KMnO 4(aq) until the first permanent pink colour is seen in the conical flask • repeats the titration three times. 150 cm3/ 250 cm3 conical flask 2 5070/42/O/N/11© UCLES 2011 For Examiner’s Use 1 10 20 30 40 50 ABC (a) Which of the above apparatus A, B or C, is used for measuring out a fixed volume of liquid for a titration experiment? ..................................................................................................................................... [1] (b) Name this apparatus. ..................................................................................................................................... [1] [Total: 2] 15 © UCLES 2010 0652/06/O/N/10 [Turn over For Examiner's Use (d) Fig. 6.2 shows the next experiment. The teacher places one drop of bromine in 50 cm 3 of water in a beaker. She stirs the mixture to make the bromine dissolve. S h e p l a c e s 1 0 cm 3 s a m p l e s o f t h e b r o m i n e w a t e r i n e a c h o f t h r e e g a s - j a r s . E a c h gas-jar contains one of the gases ethane, ethene and methane. She shakes the jars. The bromine water in one of the jars loses its colour. bromine ethane brominewater ethene methane Fig. 6.2 (i) Which gas, ethane, ethene or methane, reacts with the bromine? [1] (ii) What does this show about the structure of the molecules of the gas that reacts? [1] (e) The teacher gives a student a crystal of iodine in a dry test-tube. She tells her to warm the test-tube using a small flame. Fig. 6.3 shows the student’s diagram of the result. heat iodinecrystal colouredvapour tiny crystalsof iodine Fig. 6.3 (i) What is the colour of the vapour? [1] 15 © UCLES 2010 0652/06/O/N/10 [Turn over For Examiner's Use (d) Fig. 6.2 shows the next experiment. The teacher places one drop of bromine in 50 cm3 of water in a beaker. She stirs the mixture to make the bromine dissolve. S h e p l a c e s 1 0 cm3