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Strong base is dissolved in 655 mL of 0.200 M weak acid (Ka = 3.12 × 10-5) to make a buffer with a pH of 3.90. Assume that the volume remains constant when the base is added. a) Calculate the pKa value of the acid and determine the number of moles of acid initially present. b) When the reaction is complete, what is the concentration ratio of conjugate base to acid? c) How many moles of strong base were initially added?
In certain electrolysis experiment involving Al3+ ions, 57.0g of Al is recovered when a current of 0.352 A is used
draw the structure or structures of ALL the carbocations that could potentially form from the alkenes, and 3) label each carbocation as primary, secondary, or tertiary.
Show the chemistry involved in dissolving iron(II)hydroxide with a strong sodium cyanide solution.
Calculate the grams of Titanium that will be plated from a Ti(NO3)4 solution using a current of 15 amperes for 3 hours
A gaseous mixture of O2 and N2 contains 39.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 645 mmHg
A change in the primary sequence of a protein will never change how a protein is allosteric regulated. a.) True b.) False Which of the following is NOT a mechanism of enzyme regulation? a.) Feedback inhibition by a product. b.) Addition or removal..
calculate the pH of a soluion created by mixing 389.5 mL of .182 M HC4H7O2,
Derive the expression for the energy of a molecule, Consider the system of a gas adsorbed onto a surface. The gas can be treated as a two-dimensional ideal gas
A gas occupying 28 mL at standard conditions is heated to 13?C while the pressure is reduced to 0.84119 atm. What is the new volume occupied by the gas.
Given that the ionization energy of gaseous potassium is 419 kJ mol -1, calculate the lattice energy of potassium chloride.
What is the maximum kinetic energy of an ejected electron if platinum metal is irradiated with 174-nm light? The threshold wavelength for a platinum metal surface is 212 nm.
State whether you would expect the entropy change, delta S, to be positive, negative, or approximately zero for each of the following reactions: (a) A + B --> C (b) A + B --> C + D (c) A --> B + C Please explain.
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