1.)Rank the given compounds based on their relative Brønsted acidities. H-F, H-CH3, H-SH, H-NH2, H-CL 2.)...

Question

Question

1.)Rank the given compounds based on their relative Brønsted acidities. H-F, H-CH3, H-SH, H-NH2, H-CL

2.) Write the chemical equation for the reaction of carbonic acid (H2CO3) with water.

3.) The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.250 M NaOH.

What volume of NaOH is needed to reach the end point of the titration?

What was the initial concentration of HCl?

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Answer 1

Answer #1

bronsted acidity --> how easy they DONATE an H+

therefore

H-CL -->

H-NH2 --> this is NH3, a base, it actually is easier to get H2-NH2 or NH4+

H-F --> weak acid Ka = 3.17

H-CH3 --> pretty weak acid, will remain as CH4

H-SH --> weak acid pKA = 7.05

then

order:

least acidic : H-CH3 < H-NH2 < H-SH < H-F < H-Cl

2)

H2CO3(aq) + H2O(l) <--> HCO3-(aq) + H3O+(aq)

HCO3-(aq) + H2O(l) <--> CO3-2(aq) + H3O+(aq)

overall

H2CO3(aq) + 2H2O(l) <--> CO3-2(aq) + 2H3O+(aq)

3)

this is impossible to determine if no volume of NaOH is known

i.e.

M1V1 = M2V2

mol of acid = mol of base

mol of acid = M1*10

mol of base = 0.25*V2