Which elements can join with other elements to form covalent bonds? Check all that apply.
2 answers:
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Answer:
Explanation:
a) Balanced equation
The balanced chemical equation for the titration is
b) pH at start
For simplicity, let's use B as the symbol for NH₃.
The equation for the equilibrium is
(i) Calculate [OH]⁻
We can use an ICE table to do the calculation.
B + H₂O ⇌ BH⁺ + OH⁻
I/mol·L⁻¹: 0.150 0 0
C/mol·L⁻¹: -x +x +x
E/mol·L⁻¹: 0.150 - x x x
Check for negligibility:
(ii) Solve for x
(iii) Calculate the pH
(c) pH at equivalence point
(i) Calculate the moles of each species
B + HI ⇌ BH⁺ + I⁻
I/mol: 3.00 3.00 0
C/mol: -3.00 -3.00 +3.00
E/mol/: 0 0 3.00
(ii) Calculate the concentration of BH⁺
At the equivalence point we have a solution containing 3.00 mmol of NH₄I
Volume = 20.00 mL + 20.00 mL = 40.00 mL
(iii) Calculate the concentration of hydronium ion
We can use an ICE table to organize the calculations.
BH⁺+ H₂O ⇌ H₃O⁺ + B
I/mol·L⁻¹: 0.0750 0 0
C/mol·L⁻¹: -x +x +x
E/mol·L⁻¹: 0.0750 - x x x
(iv) Calculate the pH
The titration curve below shows the pH at the beginning and at the equivalence point of the titration.
