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A 0.411-g sample of potassium hydrogen phthalate, KHC8H4O4 (molar mass=204.44 g/mol) is dissolved with 50 mL of deionized water in a 125 mL Erlenmeyer flask. The sample is titrated to the phenolphthalein endpoint with 15.17mL of a sodium hydroxide solution. What is the molar concentration of the NaOH solution? Express the molar concentration of NaOH to the correct number of significant figures?
A 25.00-mL aliquot of a nitric acid solution of unknown concentration is pipetted into a 125-mL Erlenmeyer flask and 2 drops of phenophthalein are added. The above sodium hydroxide solution (the titrant) is used to titrate the nitric acid solution (the analyte). If 16.77 mL of the titrant is dispensed from a buret in causing a color change of the phenolphthalein, what is the molar concentration of the nitric acid (a monoprotic acid) solution? Express the molar concentration of HNO3 to the correct number of significant figures.
What is the pressure in a 65.0L cylinder filled with 0.235 moles of nitrogen gas at a temperature of 105K.
Draw any resonance form and state whether it is more or less stable than the original. ( if this is explained i will reward all points)
Analysis of a sample of a gaseous compound shows that it contains 85.6% C and 14.4% H by mass. At standard conditions (STP), 120.4 mL of the compound weighs 0.151 g. What is the molecular formula of the compound
A 10mL sample of aquarium water was treated with reagents to form a colour, and after dilution to 100 mL was found to have an absorbance of 0.162. calculate the concentration in ppm of nitrite in the aquarium water.
Can someone please show me a mechanism for a Diels-Alder Green Organic Phototchemistry reaction mechanism? We used 9-(hydroxymethyl) anthracene, deionized water, and N-methylmaleimide as the reagents and allowed to solution to reflux.
When compound Y is heated, it decomposes to the element X and hydrogen gas. Decomposition of 1g of Y yields 0.0250 mol of gas. Calculate the possible molar mass values for X.
Discuss the behavior of tungsten trioxide (or molybdenum trioxide) and product(s)
The vapor pressure of chlorine dioxide (ClO2 ) is 155 Torr at -22.75 ? C and 485 Torr at 0 ? C. What is the normal boiling point of chlorine dioxide?
What are the main greenhouse gases? What is the present level of atmospheric carbon dioxide? Why has carbon dioxide concentration risen since 1860?
the concentration of h ion in gastric juice is 0.1 m. ph of the protons arise from blood 7.4.compute the free energy
copper was first heated up in a crucible with sulfur to form copper sulfide. so if there is enough oxygen present to
A 1.245 gram sample of a compound containing barium and oxygen was dissolved in hydrochloric acid to give a solution of barium ion, which was then completely precipitated out with an excess potassium chromate to give 2.012 grams of barium chromate..
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