Question

= * Pau CHON + NO-022 0 Danielle Mitchell Homework Lecture 7 Name Danielle Min _Morning Noon Afternoon Rev 10 7-1. Which of the following pairs of liquids are likely to be miscible? - CoHo and CH,OH - no np - Polour - H20 and co - no - Cahy and(CsHe - yes me te 7-2. The concentration of glucose in blood is approximately 90 mg/100mL. What is the weight/volume % concentration of glucose? What is the molarity of glucose (glucose has a molecular weight of 180.2 g/mole)? 7-3. A dilute solution of boric acid, HBO3, is often used as an eyewash. How would you prepare 750 mL of a 1.85% (w/v) boric acid solution? 7-4. When it is said that compounds which are like each other are miscible in each othe what characteristic of the compounds have to be alike? The polarity of the molecules must be alike in order for them to be miscible. 7-5. How many moles of solute are in the following solutions? COH

Answer 1

7-2:

1% w/v means 1 gram of solute dissolved in 100 mL of solvent, 1 g = 1000 mg

90 mg/100mL = 0.09 g / 100 mL = 0.09%

w/v % concentration = 0.09%

molarity of glucose = [mass of glucose / molar mass of glucose] x [1000 / volume in mL]

molarity of glucose = [0.09g / 180.2 g/mol] x [1000 / 100 mL]

molarity of glucose = 0.005 mol/L = 0.05 M

molarity of glucose = 0.05 M

7-3:

1.85 % w/v means 1.85 g dissolved in 100 mL = 1.85g/100 mL = 0.0185 g / mL

750 mL ==> 750. mL x 0.0185 g/mL = 13.875 g

Transfer 13.875 g of H₃BO₃ into a clean, dry graduated 1000 mL measuring cylinder and add distilled, de-ionized pure water upto the 750 mL mark.

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