15. To prepare 250.0 mL of a 0.07500 M solution of AgNO, from the solid reagent,

Question

15. To prepare 250.0 mL of a 0.07500 M solution of AgNO, from the solid reagent, what mass of reagent must be used?AgNO3 169.87 g/mol (A) 3.185 g (C) 75.00g 2500 0.2S Molar Mass omol 0.e? 500.25-wels (B) 5.662 g 18.75 g 16. What is the main reason that sodium hydroxide is not considered a good candidate to be a primary standard? (A) Sodium hydroxide is relatively expensive. B)Sodium hydroxide is hygroscopic. (C) Sodium hydroxide has low solubility in water (D) Sodium hydroxide has a low molar mass. his -S eso, se lhly sm2 17. Dichloroacetic acid (Cl,HCCOOH) has a pKa of 1.3. What is the pH of a 0.125 M solution of potassium dichloroacetate? d. 7.2 a. 1.1 b. 1.3 c. 6.8

Explanation / Answer

15)

V = 250 ml of

M = 0.075 M AgNO3

mass needed?

MW = 169.87 g/mol

mass = mol*MW

mol = M*V = .250*0.075 = 0.01875 mol of AgNO3

mass = mol*MW = 0.01875 *169.87 = 3.19 grams of AgNO3 (answer is A)

NOTE:

please conside rposting question 17 in another set of Q&A. We are not allowed to answer to multiple questions in a single set of Q&A

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