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A buffer is a chemical that can be used to make solutions that resist change in pH near the the buffer's pKa upon addition of an acid or a base.
A piece of magnesium metal weighing the 1.56 g is placed in the 100.0mL of 0.100 M AgNO3 at 25°C. Determine the [Mg2+] and [Ag+] in the solution at equilibrium.
Determine how much energy is required to raise the temperature of a 1000gallon tub of water from 75 degrees Fahrenheit to 100 degrees Fahrenheit?
A quantity of 54.2 g of the compound is heated in an oven to drive off the water. A certain hydrate has the formula MgSO4 x H2O. If the steam generated exerts a pressure of 24.8 atm in a 2Lcontainer a
How can find out the limiting molar conductivities of NA+ AND OH- Determine the hydrodynamic radius of these ions.
The qualitative analysis scheme contains a vast array of reactions involving the precipitation, formation of oxidation-reduction and the coordination complexes.
Determine the % dissociation and the Ka for trichloracetic acid if the trichloroacetic acid (CCL3COOH) is a corrosive acid used to precipitate proteins and the PH of a 0.050 M solution of it is1.40
Determine the volume of air calculated by the spirometer in cubic centimeters when a lung-full of air (350 cm 3) is exhaled into a spirometer, advice that measures lung capacity.
Determine the standard free-energy change ΔG o for the following reaction at the 25oC from standard electrode potentials. Suppose you will need to use the relevant half-reactions to ba
What volumes of equimolar aqueous solutions of KH2PO4 and K2HPO4 must she combine to make 100 mL of the pH 7.00 buffer? A microbiologist is preparing a medium on which to culture E.
Determine the concentration of each ion after mixing when the 12.0mL of 0.30M FeCl3 is added to the 24.0 mL of 0.45MSr(NO3)
Calculate the ionization constant of the acid. When the 40.0 mL of a weak monoprotic acid solution is titrated with the 0.100 M NaOH, the equivalence point is reached when the 35.0 mL base have been
The "fluoride" is often present in the range of 1.4 ppm. But, in reality, this total fluoride is a mixture of F- and HF because HF is a weak acid.
Determine the standard cell potential for the Sn2+ (aq)+ Ni (s) → Sn (s) + Ni 2+ (aq). In a certain cell, the concentration of Sn 2+ is 0.0010 M and the concentra
The equilibrium partial pressures of N2O4 and NO2 are 0.20atm and 0.15 atm, respectively at the 25°C. Determine the partial pressure of the gases when a new equilibrium is established
The activation energy of the exothermic reaction is greater than that of endothermic reaction. Outline the potential energy profile diagrams for these 2 reactions on the same graph.
Determine how many grams of CuS are obtained by passing a current of 12A through a solution of CuSO4 for 15minutes?
Determine the wrong with this setup? If the tech prepared a solution containing equimolar concentrations of H2CO3 and HCO3- , what would be the pH of the resulting buffer?
Compute the mole fraction of NaCl in this mixture after all the ice melts. Compute the freezing point of this mixture (in the Celsius) if the homemade ice-cream is frozen by churning it in a bucket
Discuss what minimum phosphate concentration would it take to precipitate a calcium phosphate kidney stone where the Ksp calcium phosphate = 1.0 x 10-25
When 25 mL of a solution which is having both Fe3+ and Fe2+ ions is titrated with the 23 mL of 0.02 M KMnO4 all of the Fe2 ions are oxidized to the Fe3+ ions.
Suppose you titrate a 38.8 ml sample of vinegar with 29.53 ml of a standardized 0.2686 N solution of NaOH. Vinegar is an aqueous solution of acetic acid, CH3COOH.
Determine the amount of heat that must be supplied to an aluminum pan which is having 750.0 ml of water to raise its temperature from the 22.3Celsius to the boiling point of water. The mass of the p
Determine how many grams of cadmium are deposited from an aqueous solution of cadmium sulphate CdSO4, when an electric current of 1.51 amps flows through the solution for 156minutes?
An aqueous solution contains these ions and concentrations: Br- [0.0010], Cl [0.0010], and CrO42-[0.0010]. A solution of silver nitrate is added drop wise to the aqueous solution. Explain which