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A mixture of sodium salts may contain one or more of the anions(Cl-, I-, SO42-, NO32-,PO43-) . All of the salts are readily andcompletely soluble in cold water. Two samples of this aqueoussolution s
The solubility of benzoic acid in water is6.8g/100mL at 95 C and 0.3g/100mL at 25 C. You are given 10g ofbenzoic acid. Calculate the amount of water that you would use to recrystallize the sample.
At the beginning of a titration to standardize the NaOHsolution, Student A adjusted very carefully the initial burettevolume to 0.00 ml. But he did not notice an important air bubble atthe tip of th
What is the vapor pressure of a 45.0% solution of glucose,C6H12O6, at 90oC, given that the vapor pressure of pure water at that temperature is 526mmHg.
Using phosphoric acid, what is the pH of the solution if u add 1.524g of phosphoric acid to enough water to make 100.0mL of solution? Using pka of acid are 2.16, 7.21, and 12.32 each.
Thionyl chloride, SOCl2, is used as a very powerfuldrying agent in many synthetic chemistry experiments in which thepresence of even small amounts of water would be detrimental.
Although we usually think of substances as "burning" only in oxygengas, the process of rapid oxidation to produce a flame may alsotake place in other strongly oxidizing gases.
Thiamine hydrochloride(C12H18ON4SCl2) is awater soluble form of thiamine (vitamin B1; Ka=3.37 X 10^-7). How many grams of the hydrochloride must be dissolved in 10.00 mL ofwater to give a pH of 3.20
0.300 moles of an unknown monobasic weak acid are added to 1.20 L of water. The resulting solution has a pH of 8.800. What is the Ka of the conjugate acid of the unknown base? Assume no change in vo
You want to make the buffer but you find you are out ofsodium dihydrogen phosphate so you must start with phosphoric acid.What is the pH of the solution if you add 1.524g of phosphoric acidto enough
One biochemical reaction has a standard Gibbs energy of-200kJ/mol and a second biochemical reaction has a standard Gibbsenergy of -100kJ/mol at the same temperature. What is the ratio of their equi
Oxygen gas is collected overwater at a temperature of 10 C and a pressure of 1.02 atm. The volume of gas plus water vapor collected is 293 mL. What volume of oxygen at STP was collected?
An experiment that led to the formation of the new field of organicchemistry involved the synthesis of urea,CN2H4O, by the controlled reaction of ammoniaand carbon dioxide.
The standard recipe used in an exercise uses 3.0 mL of 0.25% phenanthroline solution in 100 mL of final solution to generate the red iron-phenanthroline complex which is determined colorimetrically.
Copper in salt water near the discharge of a sewage treatment plantis determined by first seperating and concentrating it by solventextraction of its dithizone chelate at pH 3 into methyl chloridean
What voltage must be applied to the membrane to open a K+channel? In other words, at what voltage are there equal concentrations of (only) K+ across the membrane?
The pressure of 6.0L of an ideal gas in a flexible container isdecreased to one-third of its original pressure, and its absolute temperature is decreased by one half. What is the final volume of th
Suppose that you are given a 0.700 M acetic acid solution and a 0.500 M sodium acetate solution. Determine the volumes of each solution required to prepare 160ml of a buffer with pH 4.65
The solubilities of cholesterol in water and chloroform are0.250 mg/100mL and 1.00 g/4.5mL, respectively. Estimate thepartition coefficient of cholesterol between chloroform and water.
Compound A is an optically active alcohol. Treatment with chromic acid converts A into a ketone, B. In a separate reaction, A is treated with PBr3, converting A into compound C. Compound C is purifi
Positronium consists of an electron and a positron (same mass, opposite charge) orbiting round their common centre of mass. The broad features of the spectrum are therefore expected to be hydrogen-l
A 16 ounce speciality coffee drink contains 254mg caffeine. If all the caffeine is extracted and dissolved in an equal amount of water, what is the pH of the solution? what is the percent ionization
If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?
Suppose that 22.4 liters of air at STP is used to burn 3.50 g of carbon to form CO2, and that the gaseous product is adjusted to STP. What is the volume and the average molar mass of the resulting m
What is the magnitude of the maximum stress that exists at the tipof an internal crack having a radius of curvature of 5.5 ×10-4 mm ( 2.165 × 10-5 in.) and a cracklength of 5 × 10-