Concentration Calculations and Molarity Questions Explained
School
Epping High School**We aren't endorsed by this school
Course
CHE 123
Subject
Chemistry
Date
Dec 9, 2024
Pages
1
Uploaded by AmbassadorWillpower15809
36 Revision Of Concentration 1. V&;hiclhtaltemative? slicg)v()vs flfie rfl‘umbler of moles . of solute present in mL of a solution with and MO|arlty concentration 0.2 mol L. (A) 002 (B) 0.1 (©) 020 (D) 500 12. You have 200 mL of a solution, with concentration QUESTIONS st s e N iyt 0.36 mol L™" . If you dilute this solution to a volume of 600 mL, what would be the concentration of the 1. Four grams of salt are dissolved in water and made diluted solution? up to 250 mL of salt solution. The concentration of (A) 0.12mol L (B) 1.08 mol L™ the salt solution in grams per litre is closest to: (C) 1.98mol L™ (D) 0.36 mol L! A) 4 (B) 16 ©) 32 (D) 58 13. The mass of solute needed to prepare 250 mL of a 2. The molarity of a solution that contains 0.5 moles in 0.5 mol L' solution of nickel bromide would be: 500 mL of the solution is: (A) 17.32¢ B) 2731¢g (A) 0.5 mol per litre. (B) 1 mol per litre. (C) 54.62¢ (D) 109.12 ¢ (C) 2 grams per litre. (D) 0.5 g per litre. 14. To convert 50 mL of a 2 mol L™! solution to a 3. 15 grams of sodium chloride is dissolved in water solution with concentration 0.5 mol L™, the dilution and made up to 250 mL of salt solution. The required would be: molarity of this solution is closest to: (A) 1in4 (B) 1in 10 (A) 1.0mol L™ (B) 1.2mol L Q) =5 (D) 50t0 0.5 (€) 40mol L™ (D) 15.0 mol L™ 15. To dilute 50 mL of a 2 mol L™ solution to a solution 4. Identify the most concentrated sodium chloride with concentration 0.5 mol L™, the volume of water solution from the following. you would need to add is: (A) 1 ppm (m/m) (B) 1% (m/m) (A) 100 mL (B) 150 mL © 1gL” (D) 1molL™ (C) 50 mL (D) None of the above. 5. Identify the correct definition of ppm (m/m). 16. To make up a standard solution you must have a: (A) The mass in grams of solute per kilogram (A) Measuring cylinder. (B) Burette. of solution. (C) Conical flask. (D) Volumetric flask. (B) The mass in milligrams of solute per litre 17. What is the volume of a 0.1 mol L' solution of of solution. ' hydrochloric acid if it contains 1.46 grams of (C) The mass in milligrams of solute per kilogram hydrochloric acid? of solution. (A) 0.1L (B) 04L (C) 40L (D) 400L (D) The mass in grams of solute per litre of solution. 18. In a sodium chloride solution of concentration 6. In atable of values, the concentration of oxygen 0.1 mol L', what is the concentration of chloride in air is given as 20.94. Identify the unit of ions in ppm? ‘ concentration being used in the table. (A) 0.1 ppm (B) 355 ppm (A) ppm (m/m) (B) mol L™ (C) 3550 ppm (D) 0.355 ppm (C) % (vlv) (D) gL 19. A characteristic feature of chromatography is the use of: 7. Asolution of copper sulfate has 20 grams of solute (A) A mobile and a stationary phase. in 500 mL of solution. Identify the % (m/m) of the (B) A spectroscope. solution. (C) Ultraviolet radiation. (A) 0.004 (B) 1 © 2 D) 4 (D) A strong magnetic field. 8. Bronze is an alloy that is made of copper and tin. 20. Advantages of HPLC include: A 2 kg sample of bronze contains 300 grams of tin. (A) Ttis a fast process. Identify the % (m/m) of tin in the bronze. (B) It can be used to monitor a process continually. A) 3 B) 15 (©) 30 (D) 60 (C) Ttis a sensitive and accurate technique. 9. Abottle of household cleaning liquid is labelled as (D) All of the above. containing 48 milligrams per millilitre of antiseptic 21. Atomic absorption spectroscopy (AAS) is compound. Identify the % (m/m) of this solution. a technique which could be used to find the (A) 480 (B) 48 (©) 438 (D) 0.48 concentration of which component in river water? 10. The number of moles present in 5.84 g of sodium (A) Sodium chloride. (B) Dissolved oxygen. chloride is closest to: (A) 0.1 (B) 1 (C) 584 (D) 10 (C) Copper ions. (D) Phosphate ions. INQUIRY QUESTION How are chemicals in solutions measured? Science Press Surfing NSW Chemistry Modules 1 and 2 MobuLe 1 PROPERTIES AND STRUCTURE OF MATTER m MobuLEe 2 INTRODUCTION To QUANTITATIVE CHEMISTRY § 153 4 3 sJ
