What is the pH of this solution prepared by dissolving 0.28 grams of KOH in 250 mL of solution? (molar mass KOH = 56.11 g/mol)
What is the pH of this solution prepared by dissolving 0.28 grams of KOH in 250...
What is the pH of a solution that is prepared by dissolving 7.20 grams of salicylic acid (formula weight = 138.12 grams/mol) and 7.12 grams of sodium salicylate (formula weight = 160.10 grams/mole) in water and diluting to 700.00 mL? The Ka for salicylic acid is 0.00105.
What is the pH of a solution that is prepared by dissolving 9.90 grams of pyruvic acid (formula weight = 88.06 grams/mol) and 9.25 grams of sodium pyruvate (formula weight = 90.04 grams/mole) in water and diluting to 800.00 mL? The Ka for pyruvic acid is 0.00324.
What is the molarity of a solution prepared by dissolving 5.90 grams of calcium nitrite [Ca(NO2)2, molar mass=132.10 g/mol] in enough water to make a 106.0 mL soln?
a solution was prepared by dissolving 27.0 g KOH in
100 g water. A) what is mole fraction of KOH in solution? B) what
is mass percent?C) what is the molality?
2. A solution was prepared by dissolving 27.0 g KOH(s)in 100.0 g water. You may use the chart below if you find usefiul to answer questions a) -e) MW (g/mol Mass ()moles 56.1 H20 18.0 Solution (a) What is the mole fraction of KOH in the solution? (5 pts...
Question 27 (1 point)B A solution is prepared by dissolving 4.12 grams of a nonelectrolyte in 60.0 grams of water. If the boiling point of this solution is 100.15°C, what is the molar mass of the unknown substance? 844 g/mol 851 g/mol 0.351 g/mol 1.28 g/mol 234 g/mol
What is the pH of a solution that is prepared by dissolving 2.49 g of pyridine (79.10 g/mol) in 100 mL of 0.0550 M HCl and diluting to 900.0 mL?
1.) What is the molarity of a potassium hydroxide solution prepared by dissolving 2.74 g KOH in 4.2 mL of water? 2.) How many grams of sodium hydroxide are delivered by 6.8 mL of a 10 % solution in water? 3.) Hydrogen chloride (a gas) is dissolved into water to create hydrochloric acid, and therefore is a solution. Commercially available concentrated hydrochloric acid is sold as a 35 - 37 % solution. What molarity does this equate to? 4.) How...
6. What is the pH of a solution prepared by dissolving 1.00 g of (CH3)2NH in enough water to form 500. mL of solution? What is the pH of this solution? 7. What is the molarity of hydronium ion and pH of 0.035 M ammonia solution? 8. Arrange following equimolar solutions in the order of increasing pH: NaCl, HF, NH3, and KOH. Explain your reasoning.
2. A student prepared a stock solution by dissolving 15.0 g of NaOH in enough water to make 150 mL of a stock solution. She then took 22.5 mL of the stock solution and diluted it with enough water to make 250. mL of a working solution. (5 pts. each) A. What is the molar concentration of NaOH in the stock solution? # of moles x 1000 Naot mass= 15,09 g molanty volume of source (m) Mol 40 g/mol voline...
QUESTION 8 What is the mass percent of a solution prepared by dissolving 18.9 grams of solid into 39.5 grams of water? OA) 47.8% O B) 58.4% C) 32.4% OD) The identity of the compound must be known. E) none of the above QUESTION 9 1 points What is the molarity of a solution prepared by dissolving 54.3 g of Ca(NO3)2 into 355 ml of water? A) 0.331 M B) 0.932 M C) 0.117 M D) 1.99 M E) none...