Determine the pH at the point in the titration of 40.0 mL of 0.200 M H2NNH2 with 0.100 M HNO3 after 80.0 mL of the strong acid has been added. The value of Kb for H2NNH2 is 3.0 x 10-6. 1 3 NEXT > Use the table below to determine the moles of reactant and product ater the reaction of the acid and base. H2NNH2(aq) H*(aq) H,NNH3 (aq) Before (mol) Change (mol) After (mol) 5 RESET 0.100 + x 0.100 - x 0.100 0.200 +x 6.00 x 10 -6.00 x 103 0.200 x -1.00 x 103 2.00 x 103 -2.00 x 103 0.200 + x 1.00 x 103 7.00 x 103 -7.00 x 103 8.00 x 103 -8.00 x 103

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**Determining pH in a Titration Scenario**

**Problem Statement:**
Determine the pH at the point in the titration of 40.0 mL of 0.200 M hydrazine (\( \text{H}_2\text{NNH}_2 \)) with 0.100 M nitric acid (\( \text{HNO}_3 \)) after 80.0 mL of the strong acid has been added. The value of \( K_b \) for hydrazine is \( 3.0 \times 10^{-6} \).

**Titration Table:**
Use the table below to determine the moles of reactants and product after the reaction of the acid and base.

\[
\begin{array}{|c|c|c|c|}
\hline
& \text{H}_2\text{NNH}_2(\text{aq}) & \text{H}^+(\text{aq}) & \text{H}_2\text{NNH}_3^+(\text{aq}) \\
\hline
\text{Before (mol)} &  &  &  \\
\hline
\text{Change (mol)} &  &  &  \\
\hline
\text{After (mol)} &  &  &  \\
\hline
\end{array}
\]

**Interactive Options:**
- Users can select different options to calculate changes and results:
  - \( +x \)
  - \(-x\)
  - \( 0 \)
  - \( 0.100 \)
  - \( 0.200 \)
  - Various numeric values in scientific notation

**Reset Button:**
- A reset button is provided to start the calculation over.

**Steps to Solve:**
1. Calculate initial moles of hydrazine and nitric acid.
2. Use the stoichiometry of the reaction to find changes in moles.
3. Determine moles of each species after reaction.
4. Calculate the pH based on concentrations and the given \( K_b \) value.

This setup assists learners in understanding titration calculations and pH determination through guided practice with real-time feedback on their inputs.
Transcribed Image Text:**Determining pH in a Titration Scenario** **Problem Statement:** Determine the pH at the point in the titration of 40.0 mL of 0.200 M hydrazine (\( \text{H}_2\text{NNH}_2 \)) with 0.100 M nitric acid (\( \text{HNO}_3 \)) after 80.0 mL of the strong acid has been added. The value of \( K_b \) for hydrazine is \( 3.0 \times 10^{-6} \). **Titration Table:** Use the table below to determine the moles of reactants and product after the reaction of the acid and base. \[ \begin{array}{|c|c|c|c|} \hline & \text{H}_2\text{NNH}_2(\text{aq}) & \text{H}^+(\text{aq}) & \text{H}_2\text{NNH}_3^+(\text{aq}) \\ \hline \text{Before (mol)} & & & \\ \hline \text{Change (mol)} & & & \\ \hline \text{After (mol)} & & & \\ \hline \end{array} \] **Interactive Options:** - Users can select different options to calculate changes and results: - \( +x \) - \(-x\) - \( 0 \) - \( 0.100 \) - \( 0.200 \) - Various numeric values in scientific notation **Reset Button:** - A reset button is provided to start the calculation over. **Steps to Solve:** 1. Calculate initial moles of hydrazine and nitric acid. 2. Use the stoichiometry of the reaction to find changes in moles. 3. Determine moles of each species after reaction. 4. Calculate the pH based on concentrations and the given \( K_b \) value. This setup assists learners in understanding titration calculations and pH determination through guided practice with real-time feedback on their inputs.
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