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a buffer solution is prepred by adding 15.00g of sodium acetate (NaC2H3O2) and 12.50g of acetic acid to enough water to make 500mL (three significant figures) of solution.
a) What is the pH of the buffer?
b) If buffer is diluted by adding enough water to make 1.5L of solution. What is the pH of the solution?
A piece of metal of mass 20 g at 99?C is placed in a calorimeter containing 55.8 g of water at 23?C. The final temperature of the mixture is 30.4?C.
If it takes 75.0 min for the concentration of a reactant to drop to 20% of its initial value in a first-order reaction, what is the rate constant for the reaction?
burning 0.43g of the compound X (only contain C,H,O)in excess oxygen gives 1.10g of CO2 and 0.45g of H2O. what is the empirical formula?
calculate the pH of a sodium cyanide solution that is 0.37M NaCN. The Ka for hydrocyanic acid HCN is 4.00E-10.
What is the coordination geometry about the vanadium ion incrystals of the alum? Write balanced equations for each reduction step. Assuming an average current of 1.75amps is passed during theelectrolysis, calculate how long it would take to reduce ..
You want to produce a mixture containing 19 wt% NaCl. Find the volume of the second feed solution.
consider the decomposition of liquid benzene to gaseous acetylene according to the following reaction C6H6=3C2H2 what is the delta H for the formation of 1 mole of acetylene?
What is the expected freezing point of an aqueous solution of 2.62 kg of nitric acid, HNO3 , in a solution with a total mass of 5.91 kg? Assume that the nitric acid is completely ionized.
An aqueous solution is 13.0% by mass ethanol, CH3CH2OH, and has a density of 0.978 g/mL. The molality of ethanol in the solution is?
Calculate the solubility (in mol/L) of silver chloride in 2.0 M NH3 solution. How many grams of AgCl will dissolve in 500. mL of 2.0 M NH3?
water to give a solution that has a vapor pressure of 37.2 torr at 35 °C? Assume complete dissociation of the solute and ideal solution behavior
What is the correct expression for the molarity of the solution? (Be sure to express your answer to the correct number of significant figures and also show the absolute uncertainty.)
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