What is the % of Na2CO3 in the unknown sample?

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To determine the percentage of Na2CO3 in the unknown sample, the student needs to analyze the titration data provided. The titration of HCl with NaOH and the titration of KHP with NaOH are used to establish the concentrations of the solutions involved. The reaction between Na2CO3 and HCl must be balanced to understand the stoichiometry. The student is unsure whether to use normalities for calculations and is seeking guidance on how to initiate the problem-solving process. A clear understanding of the reactions and the use of titration data will lead to the calculation of the percentage of Na2CO3 in the sample.
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Homework Statement


A student titrated 25 ml HCL with 24.79 ml NaOH. When 0.4872 g KHP was titrated with NaOH, 25.31 ml NaOH was used. A Na2CO3 solution was made using 1.8746g of unknown Na2CO3 sample in a total volume of 100 ml of solution. Then 10 mL Na2CO3 was titrated with 10.93 ml of HCL solution. What is the % Na2CO3 in the student's unknown?


Homework Equations





The Attempt at a Solution


Do I need to use normalities here? I don't even know how to start off this problem
 
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You always start by writing out the reaction of interest... HCl + Na2CO3 -----> ?
 
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