1. Why would anaqueous solution of the unknown mixture turn pink upon addition of phenolphthalein in the first step of titration? Why would the solution become colorless at the end of titration in a firststep?
2. Calculate the number of moles of sodium carbonate present in a mixture of sodium bicarbonate, sodium carbonate and a neutral component if 6.0 ml of0.100 M HCl were used to titrate 0.200 g of this mixture with phenolphthalein as the indicator.
3. Calculate the mass of sodium carbonate present in the mixture in question2.
4. Calculate th enumber of moles of sodium bicarbonate originally present in the unknown mixture in question 2, knowing that 15.0 ml of 0.100 M HCl were used in the titration, using methyl orange as the indicator.