Hey did you ever find the answers to this?
V) the amount of sugar in the solution
C) whether the sugar is stirred
V) the temperature of the solution
C) the type of solute added
C) the type of solvent used
NP.
I think Alcohol would be the correct answer, but i'm not too sure since my mind is fuzzy about chemistry
Limestone is easily weathered by acid rain. When rain mixes with gases such as sulfur dioxide and carbon dioxide in the atmosphere, acid rain is formed (sulfuric acid and carbonic acid respectively). When the rain precipitates and meets with limestone which is CaCO3, it is weathered a shown by the formulae; 2CaCO₃ (s) + H₂CO₃ → 2CaHCO3 (aq)
Geographical features formed as a result of weathering of limestone in rocks are caves, stalactites, and stalagmites.
Answer:
pKa = - 1.36012
Explanation:
∴ Ka = [H+] [A-] / [HA]
- % dissociates (%α) = ([A-] / [A-] + [HA])×100
∴ %α = 99.1%
∴ <em>C</em> HA = 0.21 M
Mass Balance:
⇒ <em>C </em>HA = [HA] + [A-] = 0.21 M............(1)
Charge balance:
⇒ [H+] = [A-] + [OH-].....[OH-] is neglected, it come from the water
⇒ [H+] = [A-]...............(2)
(2) in (1):
⇒ [HA] = 0.21 - [H+]
replacing in %α:
∴ %α = 99.1% = ([A-]/([A-]+[HA]))×100
⇒ 0.991 = [A-] / [A-] + [HA] = [A-] / 0.21 M
⇒ [A-] = (0.21 M)*(0.991) = 0.20811 M
Replacing in Ka:
⇒ Ka = [H+]² / (0.21 - [H+])
∴ [H+] = [A-] = 0.20811 M
⇒ Ka = (0.20811)² / (0.21 - 0.20811)
⇒ Ka = 22.9152
⇒ pKa = - Log (22.9152)
⇒ pKa = - 1.3601
