2002 - Q20b - Make sure you are being specific with pH’s when you are assessing whether something will be an acid or a base. Make sure you say what pH (range) each solution is eg you can say that A is greater then 12.4 because it is purple BUT for C you will need to say what pH range it covers AND then assess whether it is acid, base or neutral…
2006 – Q23a – see 2002 Q20b above
2012 – Q7 – be careful that the indicators have a a distinct color in the transitions and that for a mixture to appear yellow – all the indicators must be yellow or clear
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