Core prac 2 - preparation of standard solution

Question 1

method

Answer 1

weigh test tube, approx 2.5g sulfamic acid into test tube then reweigh accurately
dissolve acid in approx 100cm3 distilled water in beaker
transfer plus washings into 250cm3 volumetric flask and make up to mark with distilled water put into burette
set up titration
pour 25cm3 of sodium hydroxide of unknown conc into 250cm3 conical flask using pipette
use methyl orange as indicator
titrate until you have two concordant titres

Question 2

what other indicator could you use for this reaction

Answer 2

phenaolphthalein and turns pale pink at the end