Name R number TA. Section Laboratory Date Experiment 8 Post-Laboratory Questions
ID: 507424 • Letter: N
Question
Name R number TA. Section Laboratory Date Experiment 8 Post-Laboratory Questions ustify why purple a this experiment and why it is superior to good to use in phenolphthalein which is used for acid-base titrat'on titra h on teh whicn us nut ved. 2. How would the measured solubility of calcium in steps III.1-2 be effected hydroxide into the filtrate? if some undissolved to pass Ca was allowed 3. The laboratory ran out of magnes nitrate (Mg(NO,02), and your partner suggests substituting magnesium acetate (Mg(CH,co2 in steps IV.1-2 to investigate the uncommon Do you this is good Why or why not? ion effect. think a suggestion 4. Would steps III. 1-2 with a filtered saturated solution of magnesium hydroxide (Mg(OH)2) ood approach for determining the Ksp of Mg(oH)? Why or why not? 5. Use the measured solubility increase of C OH in the presence of Mig(NO3)2 (salt effect) to correct the measured solubility decrease of H)2 in the presence of c (common ion effect) for the general salt effect which is also present. 193Explanation / Answer
1.
An acid-base indicator is a dye that changes colour when pH changes.
An appropriate indicator for an acid-base titration will change colour at the same pH as the equivalence point of the acid-base reaction.
That is, the endpoint of the titration as indicated by the indicator must be the same as the equivalence point of the acid-base reaction.
For pH range 5.2-6.8 Bromocresol purple indicator used.And 8.3-10 Phenolphthalein used.
So in this experiment strong acid and weak base is there.So we used Bromocresol purple indicator.
2.
Ksp would be higher than it should be because you're finding that there's more hydroxide in solution
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