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A 25.00-mL sample of well water containing dissolved iron was treated with hydroxylamine hydrochloride, pH 5 buffer, and 1,10-phenanthroline, and diluted to 100.0 mL. Absorbances were measured at 510 nm using a 1.00-cm cell. • The prepared sample had an absorbance of 0.584 (all absorbances measured relative to water as reference). • A standard solution prepared in the same fashion, containing 5.00 mL of 5.00 x 10-4 M Fe(ClO4)3 and the reagents (no sample) had an absorbance of 0.284. • The reagent blank had an absorbance of 0.007. Calculate the molar concentration of iron in the original well water sample
What are the proper names for each of the pieces of glassware commonly used in distillation. In distillation, how is a column different than a condenser? How is a fractionating column different than a plain column
Calculate the transformation rate for the austenite-to-pearlite transformation at 650 °C and at 600 °C. Show the relationship(s) you used to arrive at your answers.
what shared property of alpha helices and beta sheets favors the formation of these structures in membrane spanning
What is the age of a rock whose Argon 40 / Potassium 40 ratio is 1.55. The half life of Potassium 40 is 1.28 x 10^9 years.
A sample of gas occupies 10.5 L at 600 torr and 50C. What volume will it occupy at STP?
The laser in an audio cd player uses light with a wavelength of 7.80* 10^2nm. Calculate the frequency of the light.
If the pH is buffered at 8.2 (as is historically typical for the ocean), what is the molar solubility of CaCO3? F) If the pH is buffered at 7.5, what is the molar solubility of CaCO3?
How many carbon atoms are present in the smallest ketone which cannot exhibit enol-keto tautomerism
An atom of aluminum (Al) has a diameter of about 1.2 10-8 cm. (a) What is the radius of a(n) aluminum atom in Angstroms (Å)? Å What is the radius of a aluminum atom in meters
1) the initial pH is 11.9 2)the volume of added acid required to reach the equivalence point is 30.3 3)the pH at 5.0 mL of added acid is 11.35 4) the pH at the equivalence point. 5) the pH after adding 6.0 mL of acid beyond the equivalence point
The volume of a gas at 95.0 kPa is 300.0 mL. If the pressure is increased to 177 kPa, what will be the new volume?
freezing point 0.00°C boiling point 100.00°C Kf 1.86°C/m Kb 0.512°C/m What is the freezing point of a solution of glucose, a nonelectrolyte, that contains 91.0 g of C6H12O6 dissolved in 323 g of water? Use molar masses with at least as many signif..
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