In a fictitious world the Thomson cathode ray experiments found the electron charge to mass ratio to be 7.13×106 C/g. A series of oil drops in the Milikan oil drop experiment were found to have excess charges of 3.50×10-19 C, 4.37×10-19 C and 2.62×10-19 C. What could be the mass of an electron?
The Taylor series for f about x=1 for a certain function f converges to f(x) for all x in the interval of converge. The nth derivative tangent line at x=1 is given by f^(n)(1) = ((-1)^(n)(n)!)/(2^(n+1)(n+1)^2) for n (less than or equal to) 2. The graph has a horizontal tangent line at x=1, and f(1)=4
Find the radius of convergence of the Taylor series for f about x=1.1 AnswerMathematics2 years ago
The gram solubility of magnesium hydroxide is 4.1x10 -3 gram per liter at 25C.
(a) Write a balanced equation for the solubility equilibrium.
(b) Write the expression for the solubility product constant, K sp , and calculate its value.
(c) Calculate the pH of a saturated solution of Mg(OH) 2 at 25C.
Solve the following problem: Ag 2 CrO 4 (s) <-> 2 Ag +1 (aq) + CrO 4 -2 (aq) Ksp = 2.0x10 -12
(a) How many grams of silver chromate can be dissolved in 150 milliliters of water?
(b) Show how the addition of hydroxide ion can cause an increase in the solubility of the silver chromate.
Using chemical reaction(s) would be key to answering this question.
(c) Beyond classifying the compound as being ionic, how can you specifically classify how the silver (I) ion
and the hydroxide act in this system? Briefly explain.
In each of the following, (a) write the reaction/equilibrium occurring and (b) show all work necessary to
solve for the pH:
(a) Find the pH of a solution containing 150.0 ml of 0.25 M Nitrous Acid (HNO 2 ; Ka = 4.5E-4)
(b) Find the pH of a solution of 1.73 g sodium nitrite (NaNO 2 ) added to 125 ml of water. Assume
that when the solid is added, there is no appreciable change in volume.
(c) Find the pH of the resulting solution when the solutions of part (a) and (b) are added together.
(c1) Explain why the pH of the nitrous acid changes upon the addition of the sodium nitrite.
(d) Find the pH when 0.80 g NaOH is added to the solution in part (c). Assume that when the
solid is added, there is no appreciable change in volume.
(e) Find the pH when 10.0 ml of 0.50 M hydrochloric acid is added to part (d).