5. When NaCl dissolves in water, which of the following is true? a. the sodium ions are surrounded by positively charged ends of the water molecules, which are the oxygen ends

b. the sodium ions are surrounded by positively charged ends of the water molecules, which are the hydrogen ends

c. the sodium ions are surrounded by negatively charged ends of the water molecules, which are the oxygen ends

d. the sodium ions are surrounded by negatively charged ends of the water molecules, which are the hydrogen ends

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .

What volume of argon gas is equal to 1.60 grams of argon