- Seeking Help On The 3rd Part 1 (101.74 KiB) Viewed 9 times
Seeking help on the 3rd part
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answerhappygod
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Seeking help on the 3rd part
Seeking help on the 3rd part
The following data were obtained when a Ca2+ ISE was immersed in standard solutions whose ionic strength was constant at 2.0 M. Ca2+ (M) E (MV) 3.28x10-5 -75.1 3.28x10-4 -46.9 3.28x10-3 -18.8 3.28x10-2 +9.33 3.28x10-1 +37.5 (a) Prepare a calibration curve and find the least-squares slope and intercept and their standard deviations. 4.0 28.143 +4.0 slope 0.009 +4.0 0.02 intercept 4.0 51.117 4.0 0.03 Sy (b) The Nernst Equation tells us the equation values based on theory, but the data we collect in the lab often doesn't exactly agree with theory. Calculate the value of the slope correction value ß in the equation below. Response of Ca²+ electrode: 4.0 0.951 E = constant + -B(º 6)log(ACa2+)(outside) 0.05916 V 2 (c) For a measured potential, the calibration curve gives us log [Ca ²+ ]. We can compute [Ca²+] = 10log [Ca2+]. Using rules for propagation of uncertainty in the Summary of Rules for Propagation of Uncertainty table, calculate [Ca2+] and its associated uncertainty for a sample that gave a reading of -21.3 ± 0.4 mV in four replicate measurements. 4.0 0.00270 4.0 0.00009 X M
The following data were obtained when a Ca2+ ISE was immersed in standard solutions whose ionic strength was constant at 2.0 M. Ca2+ (M) E (MV) 3.28x10-5 -75.1 3.28x10-4 -46.9 3.28x10-3 -18.8 3.28x10-2 +9.33 3.28x10-1 +37.5 (a) Prepare a calibration curve and find the least-squares slope and intercept and their standard deviations. 4.0 28.143 +4.0 slope 0.009 +4.0 0.02 intercept 4.0 51.117 4.0 0.03 Sy (b) The Nernst Equation tells us the equation values based on theory, but the data we collect in the lab often doesn't exactly agree with theory. Calculate the value of the slope correction value ß in the equation below. Response of Ca²+ electrode: 4.0 0.951 E = constant + -B(º 6)log(ACa2+)(outside) 0.05916 V 2 (c) For a measured potential, the calibration curve gives us log [Ca ²+ ]. We can compute [Ca²+] = 10log [Ca2+]. Using rules for propagation of uncertainty in the Summary of Rules for Propagation of Uncertainty table, calculate [Ca2+] and its associated uncertainty for a sample that gave a reading of -21.3 ± 0.4 mV in four replicate measurements. 4.0 0.00270 4.0 0.00009 X M