Chemistry...titration..help!?

[goodguy083]

1. Why would an aqueous 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 first step?

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 of 0.100 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 question 2.

4. Calculate the number 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.

 

[Mario]

1) A solution turns pink with Phenolphthalein because this is an indicator, and it turns pick at exactly a pH of
2) Use a periodic table, find out the molar masses and do this template

(quantity given/ molar mass) x (mole ratio of balanced equation, which is given/ wanted) x ( molar mass of wanted substance/1 mol of such)

I cant solve it for you cause I dont have a Periodic table and I might be wrong even though the template is correct. I took AP Chem as a Sophomore and we did this. I hope this was of some help.