This is your experimental data for Experiment #8, Determination of Ca in a Supplement by Ion Selective Electrode. YOU MU
Posted: Thu Jul 07, 2022 12:12 pm
This is your experimental data for Experiment #8, Determinationof Ca in a Supplement by Ion Selective Electrode. YOU MUST READ THEEXPERIMENTAL WRITE-UP AND COMPLETE THE PRE-LAB PRIOR TO DOWNLOADINGTHIS DATA!! Your unknown number is: 971 Your sample weighed 1.5640grams You follow the procedure making up your unknown. You madeyour standards, and when you measured them on the ISE meterproduced the following data: Standard A has a meter reading of-32.21 mV Standard B has a meter reading of -61.50 mV Standard Chas a meter reading of -88.90 mV Standard D has a meter reading of-96.87 mV The unknown has a meter reading of -83.71 mV Produce andsubmit a spreadsheet with a PROPERLY LABELLED calibration curvegraph with a linear least square calculation of the best fit line.Calculate the following in CLEARLY LABELLED cells in yourspreadsheet. The slope = The intercept = The R2 value = The totalamount of Ca in the unknown you were given at the start of theexperiment = mg The wt% of Ca in the unknown = %
(a) 1.00 x 10-2 M CaCl2 - Pipette 10.00 mL of 0.100 M CaCl2stock solution into a 100-mL volumetric flask. Add 5.0 ±0.1 mL ofthe buffer and dilute to the mark with deionized water. Rememberthroughout to always rinse a pipet several times with the solutionyou plan to pipet.
(b) 1.00 x 10-3 M CaCl2 - In a 100-mL volumetric flask, preparea 1:10 dilution of solution “a” above. Don’t forget to add thecorrect volume of the buffer to yield the same total concentration(i.e., 4.5 mL of the buffer; why not 5 mL?
(c) 1.00 x 10-4 M CaCl2 - In a 100-mL volumetric flask, preparea 1:10 dilution of solution “b” above. Don’t forget to add thecorrect volume of the buffer.
(d) 5.00 x 10-5 M CaCl2 - Pipette 5.00 mL of solution “b” aboveinto a 100-mL volumetric flask, add 4.75 ±0.05 mL of the buffer,and dilute to the mark with deionized water.
(a) 1.00 x 10-2 M CaCl2 - Pipette 10.00 mL of 0.100 M CaCl2stock solution into a 100-mL volumetric flask. Add 5.0 ±0.1 mL ofthe buffer and dilute to the mark with deionized water. Rememberthroughout to always rinse a pipet several times with the solutionyou plan to pipet.
(b) 1.00 x 10-3 M CaCl2 - In a 100-mL volumetric flask, preparea 1:10 dilution of solution “a” above. Don’t forget to add thecorrect volume of the buffer to yield the same total concentration(i.e., 4.5 mL of the buffer; why not 5 mL?
(c) 1.00 x 10-4 M CaCl2 - In a 100-mL volumetric flask, preparea 1:10 dilution of solution “b” above. Don’t forget to add thecorrect volume of the buffer.
(d) 5.00 x 10-5 M CaCl2 - Pipette 5.00 mL of solution “b” aboveinto a 100-mL volumetric flask, add 4.75 ±0.05 mL of the buffer,and dilute to the mark with deionized water.