The metal in the given reaction has to be identified. Concept introduction: The number of moles of any substance can be determined using the equation . Number of mole = Given mass of the substance Molar mass The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol). Molar mass = Given mass of the substance Mole of the substance For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass. Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal. Barium (option d) is the metal involved in the given reaction.

Question

3. The concentration of acetylsalicylic acid, C9H8O4, in aspirin tablets is determined by hydrolyzing it to the salicylate ion, C7H5O3-, and de¬termining its concentration spectrofluorometrically. A stock standard solution is prepared by weighing 0.0774 g of salicylic acid, C7H6O3, into a 1-L volumetric flask and diluting to volume. A set of calibration standards is prepared by pipeting 0, 2.00, 4.00, 6.00, 8.00, and 10.00 mL of the stock solution into separate 100-mL volumetric flasks that contain 2.00 mL of 4 M NaOH and diluting to volume. Fluorescence is measured at an emission wavelength of 400 nm using an excitation wavelength of 310 nm with results shown in the following table. (a) Why is the excitation wavelength (310 nm) shorter than the emission wavelength (400 nm)?(b) How is the emission wavelength isolated from the excitation wavelength in a fluorescence instrument?

Answer 1

Question

Chapter 4, Problem 94GQ

Interpretation Introduction

Interpretation:

The metal in the given reaction has to be identified.

Concept introduction:

The number of moles of any substance can be determined using the equation.

Number of mole =Given mass of the substanceMolar mass

The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).

Molar mass = Given mass of the substanceMole of the substance

For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.

Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.

Barium (option d) is the metal involved in the given reaction.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

3. The concentration of acetylsalicylic acid, C9H8O4, in aspirin tablets is determined by hydrolyzing it to the salicylate ion, C7H5O3-, and de¬termining its concentration spectrofluorometrically. A stock standard solution is prepared by weighing 0.0774 g of salicylic acid, C7H6O3, into a 1-L volumetric flask and diluting to volume. A set of calibration standards is prepared by pipeting 0, 2.00, 4.00, 6.00, 8.00, and 10.00 mL of the stock solution into separate 100-mL volumetric flasks that contain 2.00 mL of 4 M NaOH and diluting to volume. Fluorescence is measured at an emission wavelength of 400 nm using an excitation wavelength of 310 nm with results shown in the following table. (a) Why is the excitation wavelength (310 nm) shorter than the emission wavelength (400 nm)?(b) How is the emission wavelength isolated from the excitation wavelength in a fluorescence instrument?

The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that may be discharged into the sewer system. Limits have been established for a variety of substances, including hexavalent chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K2Cr2O7), what is the maximum permissible molarity of that substance?

Oxalic acid (H2C2O4) is an acid widely used in chemical analysis, industry and veterinary applications. THE Neutralization volumetry is one of the options for determining this acid in raw materials for the industry. Considering this determination, answer the items below. Being that 0.2255 g of a sample of oxalic acid raw material was weighed and titrated completely with 23.2 mL of a 0.1522 mol/L NaOH solution, what is the percent purity of this product? (Pasta molecular oxalic acid 90.03 g mol/L) [Answer; purity = 70.5%] H2C2O4 (aq) + NaOH (aq) → Na2C2O4 (aq) + H2O(l) And suggest an appropriate indicator for the titration of this acid by looking at the titration curve profile below (photo)