After making your hypothesis, you need to _____ before starting to make observations for your descriptive investigation.
2 answers:
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Here is the full question.
What is the pH of a solution that results when 0.010 mol HNO3 is added to 500 mL of a solution that is 0.10 M in aqueous ammonia and 0.20 M in ammonium nitrate? Assume no volume change. The Kb of ammonia is 1.8*10^-5.
Answer:
8.82
Explanation:
Volume = 500 mL = 0.500 L
Number of moles of NH₃ = 0.10 mole × 0.500 L = 0.050 moles
Number of moles of NH₄⁺ = 0.20 mole × 0.500 L = 0.10 moles
NH₃ + H⁺ ----------> NH₄⁺
In 0.010 mole of HNO₃ ;
Number of moles of NH₃ = 0.050 moles - 0.010 moles
= 0.040 moles
Number of moles of NH₄⁺ = 0.10 moles + 0.010 = 0.11 moles
Concentration of NH₃ =
=
= 0.080 M
Concentration of NH₃ =
=
= 0.220 M
NH₃ + H₂O ⇄ NH₄⁺ + OH⁻
Initial 0.080 M 0 0.220 M 0
Change -x +x x
Equilibrium 0.080 -x 0.220 +x x
=
=
x = [OH⁻] = 6.55 × 10⁻⁶ M
pOH = 5.18
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 5.18
pH = 8.82
Answer:
1085° C
Explanation:
From the phase diagram of Ag-Cu shown below:
The minimum value of the high-temp required to be selected for the furnace is: 1085° C
This is on the grounds that the furnace should be chosen to such an extent that it should melt any sort of possible material including pure Cu that melts and liquefies at the temperature of 1085° C.
