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A calibration curve was established for the determination of thiocyanate ions in urine. Twenty-five replicate determinations of the blank yielded a standard deviation of 1.85 response units. The slope of the calibration curve was 18.67 response unit per uM thocyanate. What is the minimum detectable concentration of thiocyanate for this method? And what is the limit of quanititation for thiocyanate by this method?
The normal boiling point of ethanol is 78.4 C, and the heat of vaporization is Delta H vap = 38.6 kJ / mol.
how many grams of sodium benzoate should be added to prepare the buffer?
What mass of formaldehyde gas must be released from building materials to produce a concentration of 50 ppm of the gas in a room with dimensions of 4m*5m*2m?
When titrating 0.15 M HCl with a calcium hydroxide solution of unknown concentration, 35 mL of acid are required to neutralize 25 mL of the base.
The Ksp of CaSO4 is 4.93× 10-5. Calculate the solubility (in g/L) of CaSO4(s) in 0.300 M Na2SO4(aq) at 25 °C.
Calculate the minimum volume of distilled water, in liters, necessary to completely dissolve a 7.5 g sample of AgBr (s) at 298K. The molar mass of AgBr is 188 g mol
A refrigeration tank holding 5.00 L of Freon gas (C2Cl2F4) at 25°C and 3.00 atm pressure developed a leak. When the leak was discovered and repaired, the tank had lost 76.0 g of the gas.
A large gas flask is found to weigh 143.567 g. it is then filled with gas to a pressure of 735 torr at 31 C and found to weigh 1067.9 g.
As you saw in Part B, the vapor above the cyclohexane-acetone solution is composed of both cyclohexane vapor and acetone vapor.
a solution made by adding .106 mol of CH3COOH to 1.0 kg of water is found to freeze at -.203 C. Calculate the percent of the acid that has undergone ionization. The molal freezing point constant of water is 1.86
The benzene-toluene system obeys Raoult's law because benzene and toluene molecules have similar shapes and electronic structures
When you combine 2-ethoxybenzaldehyde and 4-heptanone what is the product and structure of that product. With 95% ethanol and 3M sodium hydroxide
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