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Problem- The pH of 0.05 M benzoic acid is 2.24. Calculate the change in pH when 2.45 g of C6H5COONa is added to 20 mL of 0.50 M benzoic acid, C6H5COOH. Ignore any changes in volume. The Ka value for C6H5COOH is 6.5 x 10-5.
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a solution contains 100.0 g of water and 15.0 g of alcohol. what is the percent alcohol in the solution? my teacher got
When 2.20 grams of Cr(CO)6 reacts according to the following equation at 400 °K in a closed system the temperature goes down and 5.2 kJ of hear is absorbed
Calculate the maximum mass of calcium metal that should be used in an equivalent mass determination with a 100-mL gas measuring tube for collection. For the purposes of calculation, assume 80.0 mL of hydrogen gas produced at standard conditions
What is the pH of a buffer that results when 0.50 mole of H3PO4 is mixed with 0.75 mole of NaOH and diluted with water to 1.00 L, The acid dissociation constants of phosphoric acid are Ka1 = 7.5 x 10-3, Ka2 = 6.2 x 10-8, and Ka3 = 3.6 x 10-13
Find delta E, delta H, q, and w for the change in state of 1.0 mol H2O(l) at 84 degree C to H2O(g) at 109 degree C. The heat capacity of H2O(l)= 75.3 J/molK, heat capacity of H2O(g)= 25.0 J/molK, and the heat of vaporization of H2O is 40700 J/mol ..
Briefly explain why a volumetric pipet with a chipped or broken tip is usually useless,while a buret with a chipped or broken tip can still deliver accurate volumes.
Write the equations that represent the first and second ionization steps for selenic acid (H2SEO4) in water.
propane c3h8 is used in gas barbeque grills producing 2044kj per mole of c3h8propane. write the balanced chemical
a. A 0.1044 gram sample of an unknown monoprotic acid required 22.10 mL of 0.0500 M NaOH to reach the end point. What is the molar mass of the unknown?
Problem- A sample of Br2(g) takes 24.0 min to effuse through a membrane. How long would it take the same number of moles of Ar(g) to effuse through the same membrane
Problem- 1) A 0.030 M solution was prepared by dissolving dipotassium cysteine, K2C in water. Then 40.0mL of this solution was titrated with 0.060 M HClO4. Calculate the pH at the first equivalence point
how much heat is absorbed by a 2000 kg granite boulder as energy from the sun causes its temperature to change from
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