4. A salt solution consisting of 10.0% sodium chloride (salt) consists of how many parts permillion (of salt in water)?A. 10 parts per millionB. 100 parts per millionC. 1,000 parts per millionD. 10,000 parts per millionE. 100,000 parts per million

Parts per million (ppm) is expressed as mg/Litre where 1 ppm means 1mg/litre. Hence if we dissolve 1…

Answered: 4. A salt solution consisting of 10.0%…

Basic Clinical Lab Competencies for Respiratory Care: An Integrated Approach

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ISBN:9781285244662

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Chapter14: Introduction To Respiratory Care Pharmacology

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4. A 100-mL buffer solution with pH of 4.80 is prepared as a stock solution. Using this stock buffer solution, three buffers are prepared by diluting a given volume of the stock buffer (as shown below) to 100 mL with water. Volume used from Buffer Final volume, mL original solution, mL 1 5 100 2 10 100 20 100 a. Do they have the same pH? Check the box corresponding your answer. O Yes O No HY 47.1 Basic Biochemistry, Laboratory b. Which is true about their absolute concentrations? Check the box corresponding your answer. [Buffer 1] > [Buffer 2] > [Buffer 3] [Buffer 3] > [Buffer 2] > [Buffer 1] [Buffer 3] = [Buffer 2] = [Buffer 1] [Buffer 3] = [Buffer 2] > [Buffer 1] [Buffer 3] > [Buffer 2] = [Buffer 1] c. Which is true about their concentration ratios? Check the box corresponding your answer. [Buffer 1] > [Buffer 2] > [Buffer 3] [Buffer 3] > [Buffer 2] > [Buffer 1] [Buffer 3] = [Buffer 2] = [Buffer 1] [Buffer 3] = [Buffer 2] > [Buffer 1] [Buffer 3] > [Buffer 2] = [Buffer 1] %3! %3D d.…
Which of the following materials will have the greatest effect on colligative properties of a solution? a. CH3CI b. NaCl c. (NH4)2SO4 d. CH3CH2OH O A O D
2. Four unidentified solutions of equal concentration (0.1 mol/L) were prepared by chemistry students who were investigating the properties of acids and bases. Solution Red litmus Blue litmus pH Conductivit Blue No change 13.2 Very high 2 No change Red 3.5 Weak 3 No change Red 1.8 Very high 4 Blue No change 10.7 Weak Identify the acids and the bases in the list above. b. Classify the acids and the bases as being weak or strong with supporting information. Suggest another test that could be used to determine the relative strengths of the acids.
2. Use the information on the image below to find the following: h=5 cm Notes Density arwork w=6 cm ASHI 1=8 cm MASS of the object is given as 80 G a. Volume of the object - (Hint: V = Lx W x H) b. Density of the object is (Hint: Density-Mass / Volume) c. Given that density of water is 1 g/ml, use your response to question 'b' above to infer if the object would sink or float on water. Explain using appropriate science concept.
4. A stock solution has a concentration of 10M. 50 mL of this stock solution is used to make 1L of a dilute solution. What is the concentration of the dilute solution? BLOC DE GRAPHISME GR 50 5. How many grams of KCl are there in 10 mL of 20% solution.
3. If we want to find out which elements are safe for humans to consume when combined a rait an which of the following might be the best way to predict the elements that are safestte ca A. Determine how much sodium and similar elements are normally found in the human body B. Determine the properties of sodium and similar elements using the periodic table. C. Use a conductivity meter to find out if sodium and similar elements conduct electricity. D. Research the abundance of sodium and similar elements in outer space to compare to Earth. E. Look up the melting points of sodium and similar elemen compare temperatures. 4. Explain why you chose the answer you did to question #3.
The solubility of KI is 50 g / 100 g of water at 20 °C. If 110 g of Kl are added to 200 g water A. All of the Kl will dissolve B. The solution will freeze C. the container of the solution will feel warm to the touch D. a saturated solution will form E. an unsaturated solution will form
2 and 3
12. What is the pH of a solution in which [OH] = 0.000005 M? )5.3 8.7 O 5 x10
5. You are testing for unknown compounds. Evaluate the results of these tests to determine the likely contents of each unknown solution. Compound Unknown #1 Unknown #2 Unknown #3 Unknown #4 lodine Yellow Dark blue Dark blue Yellow Benedict's test Green Blue Red Orange Sudan stain No interaction Top 1/3 of the solution turns red No interaction Top of the solution turns red Conclusion: what molecules are present in this sample?
1.8
39. A salt solution of 50.0% sodium chloride (salt) consists of how many parts per million (measured as grams of salt in milliliters of water)? A. 50 parts per million B. 500 parts per million C. 5,000 parts per million D. 50,000 parts per million E. 500,000 parts per million

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4. A salt solution consisting of 10.0% sodium chloride (salt) consists of how many parts per million (of salt in water)? A. 10 parts per million B. 100 parts per million C. 1,000 parts per million D. 10,000 parts per million E. 100,000 parts per million