I\'ve included my experimental data for an experiment conducted in the lab. Plea

Question

I've included my experimental data for an experiment conducted in the lab. Please complete numbers 3-6 on the final picture I've included given that I have calculated the concentration of NaOH to be 0.1212 mol/L and the moles of HCl are 0.004908 mol. Note this is for the part 2 of the laboratory so use the appropriate data. Also, show calculations for only one of the titration samples, as I just need to see the procedure taken. Thanks!

Chemistry 1051 Laboratory Experiment 3- Back Titration 20162017 Tnble 3: Back-titrations with NaoH (60.00 ml, standardized HCI ndded) (3 marka final burette reading (mL d4.01m L 4utlmL LIR. initial burette reading volume of NaOH added (mL NITIALS and DATE: INSTRUCTO) CALCULATIONS PART 1 STANDARDIZATION OF s so DIUM HYDROXID 1. Show detailed calculations for [NaoH) in the titrant solution. Use the average volame of your three closest titrations marks) (I) VHcl 0.0024 54 mol VNOH Naukl lmci 0,00 n Naot 0.0 a02 LIL Page 6 of 10

Explanation / Answer

let MCO3 be the unknown carbonate

MCO3 + 2HCl --> H2CO3 + 2MCl

For Sample 1,

3. moles NaOH used for excess HCl = 0.1212 M x 19.70 ml = 2.38764 mmol

4. Excess HCl = 2.38764 mmol

5. moles HCl reacted with sample = 0.09816 M x 50 ml - 2.38764 mmol = 2.52036 mmol

6. moles CO3^2- ion in sample 1 = 2.52036/2 = 1.26018 mmol

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