Chemical amounts (A2)
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- What classes of reaction other than precipitation reactions could be used with the method of gravimetric analysis? 141108
- I've been given five questions on titration in class and find it immensely difficult to solve. Would you please be able to help me. The question goes like this: 20 cm3 of 0.1 mol dm-3 of ethanoic acid is titrated with 0.1 mol dm-3 KOH. Ka= 1.74 x 10-5. 1) pH at the start before any KOH added 2) pH when 10 cm33 of KOH added 3) pH when 18 cmcm3 of KOH added 4) pH when 20 cmcm3 of KOH added 5) pH when 30 cmcm3 of KOH added Could you please explain why the answers are so as well because my teacher tried to explain it but I still could not get it. 260308
- I titrated molar HCl aginst the same strength fixed volumes of sodium hydroxide, potassium hydroxide, sodium hydrogen carbonate and potassium hydrogen carbonate for my coursework. I expected the two hydroxides as strong bases to have the highest volume of acid to reach the end point. I found however that the potassium hydroxide had the lowest and the other three were pretty close. I did three readings for each alkali and they all were in a reasonable range so I can't make sense of this. I used methyl orange indicator. Can you help? 260308
updated: 21 August 2003
