Question 1 10 out of 10 points You discovered a bottle of HCI acid in your stock
ID: 1089783 • Letter: Q
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Question 1 10 out of 10 points You discovered a bottle of HCI acid in your stock room with no apparent Materials property label. Explain in detail what you would do to determine the concentration of this HCI solution if you only have a pH meter. Question 2 7out of 10 points Calculate the pH of the buffer HA when 20.0 mL of 0.50 M HA is mixed with 20.0 mL of 1.0 M NaA. (Ka = 1·8x10-s) Question 3 3 out of 10 points Calculate the solubility of mercury chloride in grams/mL. Based on your calculation, will 100.0g of mercury chloride dissolve in 500.0 mL of solvent?Explanation / Answer
Q.no:2 pH of acidic buffer = pka + log(NaA/HA)
No of mol of HA = 20*0.5 = 10 mmol
No of mol of NaA = 20*1 = 20 mmol
pka = -logka = -log(1.8*10^-5) = 4.74
pH = 4.74+log(20/10) = 5
q.3) HgCl2, ksp = 1.2*10^-18
ksp = s*(2s)2
ksp = 4s^3 = 1.2*10^-18
s = solubility of HgCl2 = 6.7*10^-7 M
s = solubility of HgCl2 in g/ml = (6.7*10^-7)*271.5 = 1.82*10^-4 g/ml
from the above data, 100 g HgCl2 does not soluble in 500 ml solvent.
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