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Write a SOP (standard operating procedure) for doing a titration

Bell Work. Write a SOP (standard operating procedure) for doing a titration. Do not use your books Hints – diagram, use known/unknown/ tips. Big Picture. Assessment at AS. CI p371. Learning Outcomes. Content Process Benefit. Skill of carrying out a titration

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Write a SOP (standard operating procedure) for doing a titration

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  1. Bell Work Write a SOP (standard operating procedure) for doing a titration Do not use your books Hints – diagram, use known/unknown/ tips

  2. Big Picture Assessment at AS

  3. CI p371

  4. Learning Outcomes ContentProcessBenefit • Skill of carrying out a titration • Calculate unknowns and percentage uncertainty • Carry out a titration • Help in 10% of AS grade!

  5. Activity ES4.1 • Carry out titration • Put your results on the board • Use the booklet to help write your results

  6. The question: 10.0 cm3 of a solution of potassium hydroxide was titrated with a 0.10 M solution of hydrochloric acid. 13.5 cm3 of the acid was required for neutralization. Calculate the concentration of the potassium hydroxide solution. Step 1 Write down everything you know from the question. I put the one we know most about on the left Hydrochloric Acid                                 Potassium hydroxide Volume used = 13.5 cm3                     Volume used = 10.0 cm3 Concentration = 0.10M                         Concentration = TBD

  7. Step 2 Write the BALANCED equation (or as much as you know about it).  HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) This is necessary to check out the ratios of reactants – in this case 1:1 so we don’t have to worry about any ratios. Step 3 Calculate the Number of Moles used of the reactant you know most about. In this case the HCl(aq) The rule here is ; Number of Moles = concentration

  8. Step 3 Calculate the Number of Moles used of the reactant you know most about. In this case the HCl(aq) The rule here is ; Number of Moles = volume × concentration Never do cm3!

  9. Step 4 Work out how many moles of the unknown you have used, this is where you may need to multiply up or down the number of moles, so if 1 mole of HCl needed 2 mol of potassium hydroxide, then at this point you would multiply the number of moles of HCl by 2. In this case this is unnecessary. Number of moles of HCl = 0.0014 mol Number of moles KOH = 0.0014 mol – they react in a one to one ratio

  10. Step 5  Work out the concentration of the potassium hydroxide. Moles of KOH (same as HCl as 1:1) – 0.0014 Volume (q) 10cm3 Concentration = 0.14 M Number of Moles = volume × concentration

  11. CH3COOH + NaOH  H2O + NaOOCCH3 • 0.1M NaOH ? CH3COOH • Volume 6cm3 10cm3 • Balance equation • No. moles = Vol dm3 x conc. • ? = (6/1000) x 0.1Moles dm-3 • ? = 6 x 104 Moles • 1:1 ratio thus 6 x 104 Moles of acid • So Conc = Moles/vol dm3 = 6 x 10 4 / (10/1000) • = 0.06 Moles dm-3

  12. Demonstrate Deduce the concentration of hydrochloric acid if 20.0cm3 is neutralised by 25.0cm3 of sodium hydroxide at 0.2oo moldm-3?

  13. Review Carry out a titration? Confident with procedure? Confident with calculations? What to do if you’re not?

  14. Home Learning Best Choice – Salters A level / ES Formula, equations, amount / Titrations and titration calculations Next lesson is halogen production conference – have poster with you and all 15.1-6 qs + ready to speak

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