A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 oC. The initial concentrations of Pb2+ and Cu2+ are 0.0500 M and 1.50 M, respectively.
a. What is the initial cell potential?
b. What is the cell potential when the concentration of Cu2+ has fallen to 0.200 M?
c. What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.35 V?
Chapter 2 Measurements • Precision – How closely a series of measurements agree with each other • Accuracy – How close a series of measurements agrees with the true value • Significant Figures – Shows level of uncertainty in measurements 1.2314, 1.2315, 1.2317 = 5 significant figures Counting Rules • Zeros between two other significant digits are significant (1.903) • A lone zero before a decimal point is cosmetic and not significant (0.193) • Zeros to the right of a decimal point that precede the first nonzero digit are placeholders and not significant (0.00193) • Zeros at the end of a number are significant if they are to the right of the decimal point (0.210) Manipulation Rules For Multiplication and Division The reported result has no more significant figures than the factor with the fewest significant figures For Addition and Subtraction The number of significant digits to the right of the decimal point in the answer should be the same as the number added/subtracted with the fewest. Rounding If the leftmost digit to be dropped is 0, 1, 2, 3, 4, – leave the final remaining digit unchanged If the leftmost digit to be dropped is 5, 6, 7, 8, 9 – increase the final digit by one. Intermediate Rounding or Not – may give different answers Energy Divided into Kinetic Energy (motion) and Potential Energy (abi