2.Calculate the number of moles of sodium carbonate present in a mixture of sodi

Question

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.

4. Calculate the number of moles of sodium bicarbonate originally present in the unknown mixture in question 2, knowing that 15.0ml of 0.100 M HCl were used in step 2 of the titration, Using methyl orange as the indicator.

I allready calculated the Molar Masses: HCl= 36.460g, Na2Co3 = 105.99g, and NaHCO3 = 84.007g

I am completly confused on these two questions and even though I have a template (quantity/MM)(Molar ration of balanced equation/wanted)(MM of wanted substance/1 mol of such) for question #2, Me and the tutor at my school could not figure these problems out.
Please show me a step by step process so that I can figure out what I am doing wrong for each question.

Thank you

Explanation / Answer

It need a periodic table , if you use a periodic table, then you will be able to 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)

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