16. If the pH of an aqueous solution changed from 4.67 to 9.10, what happened to

Question

16. If the pH of an aqueous solution changed from 4.67 to 9.10, what happened to the hydronium ion concentration? A) It decreased. B) It became zero. C) It became less than zero. D) It increased. E) none of the above 17. How is the solubility of a gas affected by the temperature of the solution? What about the pressure? 18. How many grams of KNO3 are in 125-g of solution that contains 4.5% solute by mass? 19. Calculate the mass percent of 5.00 moles of NaOH in 0.900 L of water at 25 degree C? Hint: The density of water is 1.00 g/mL at 25 degree C 20. The reason for many of the unique properties of water is: 21. What volume of 0.100 M sodium hydroxide is required to completely neutralize 50.0 mL of 0.100 M phosphoric acid? Hint: write the formulas for each 22. Calculate the molarity (m) of a solution containing 1.60 mol of sucrose (table sugar) and .200 L of water at a temperature at which the water has a density of 1.00 g/mL. 23. Which of the following is the most volatile? a) lead b) olive oil c) Water d) Motor oil e) gasoline 24. Which of the following processes are exothermic? a) Boiling b) Freezing c) Sublimation d) Evaporation e) Condensation

Explanation / Answer

16) E (ans: very low almost near to zero in +ve value)

17) by incresing the temparature the solubility increase and pressure also increases in closed container.

18) 4.5*125/100 = 5.625 gm of KNO3 is there.

19) 5*40*0.9/0.9 = wgt of NaOH = 200g

20) it is protic solvent, when we add acid it gives H+ , when we add base gives OH-,

it forms 3 hydrogen bonding in liquid state,

21) H3PO4 in mmoles = 50*0.1 = 5mmole but to nutralize this 15mmoles NaOH required because acid is triprotic

15mmoles = 0.1* volume of NaOH

volume of NaOH = 15/0.1 = 150ml

22) 1.6/0.2 = 8 M

23) e

24) d

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