PROBLEM 3 Consider a Si sample under equilibrium conditions, doped with Boron to a concentration 1017 cm-3. At T = 300K, is this material n-type or p-type? What are the majority a) and minority carrier concentrations? Answers: n-type p-type majority carriers minority carriers As the temperature of this sample is increased, ni will eventually b) increase to be higher than the dopant concentration, and the sample will become intrinsic (n =p=ni). Estimate the temperature at which this oCcurs, by finding the temperature at which ni be much greater (at least 10x higher) than the dopant concentration. (You can simply use the plot of ni vs. T in the previous problem - Problem 3.)

Problem 3-1: The ion concentrations reported for a water below are all mg/L as CaCO3. Ca²+ = 200.00; Mg²+ = 420; HCO3 =256.0; and CO₂ = 12.0. Plot the graph and find TH, CH, NCH, CCH, MCH, CNCH, MNCH Also determine the lime and soda ash dose, in mg/L as CaO and Na₂CO3, to soften the following water to a final hardness of 80.00 mg/L as CaCO3. Assume lime is 94 percent pure and soda ash is 96 percent pure. Problom 11

Answer should be 3.5 g/L,  need step-by-step, solved on paper please!

1 liter of 0.1 M glycine. Problem 2b NH3* Glycine CH₂-COO- pka's = 2.34 and 9.6 = b. in a 0.1 M solution, pH 9.0 what fraction has the amino group as −NH3+? pH = pka + log A/HA