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Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product absorbing light at 625 nm, which can be used for the spectrophotometric determination of ammonia.
To determine the ammonia concentration in a sample of lake water, you mix 10.0 mL of lake water with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution and dilute to 25.0 mL in a volumetric flask (sample A). To a second 10.0 mL solution of lake water you add 5 mL of phenol, 2 mL of sodium hypochlorite, and 2.50 mL of a 5.50 × 10-4 M ammonia solution and dilute to 25.0 mL (sample B). As a reagent blank, you mix 10.0 mL of distilled water with 5 mL of phenol, 2 mL of sodium hypochlorite and dilute to 25.0 mL (sample C). You measure the following absorbances using a 1.00 cm cuvet:
Absorbance at 625nm: Sample A = 0.518, Sample B = 0.765 Sample, C = 0.045
What is the molar absorptivity (?) of the indophenol product, and what is the concentration of ammonia in the lake water?
Calculate the work done in kJ when 3.2 moles of H2O vaporizes at 1.00 atm and 38.8 oC. Assume the volume of liquid H2O is negligible compared to that of vapour.
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a cylinder measuring 5.7 cm wide and 6.8 cm high is filled with gas. The piston is pushed down with a steady force measured to be 11 N.
Definition for electrophilic, transition state and Markovnik , electrophilic, transition state
State the chemical reaction that took place in the patient's body.
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Calculate the pressure of 4 g of nitrogen gas in a 1 L container at 20.0 ?C.
Assuming that a chemical reactions doubles in rate for each 10 C Temperature increase, by what factor would the rate increase
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