QQuestionChemistry
QuestionChemistry
Calculate the mass of KHC^8H^4O^4 (molar mass = 204.23 g/mol) that reacts with 15 mL of 0.15 M NaOH.
Express this mass of KHC^8H^4O^4 to the correct number of significant figures.
12 months agoReport content
Answer
Full Solution Locked
Sign in to view the complete step-by-step solution and unlock all study resources.
Step 1:: Write the balanced chemical equation for the reaction between KHC^8H^4O^4 and NaOH.
The balanced chemical equation is: \boxed{ \begin{aligned} \text{KHC}_8\text{H}_4\text{O}_4 + \text{NaOH} \rightarrow \text{KNaC}_8\text{H}_4\text{O}_4 + \text{H}_2\text{O} \end{aligned} }
Step 2:: Calculate the number of moles of NaOH present in the solution.
Use the formula for molarity (M = n/V) to find the number of moles (n). Rearrange the formula to solve for n: \boxed{ \begin{aligned} n = \text{Molarity} \times \text{Volume (in liters)} \end{aligned} } Calculate the number of moles: \boxed{ \begin{aligned} n_{\text{NaOH}} &= 0.15 \text{ M} \times 0.015 \text{ L} \ &= 0.00225 \text{ mol} \end{aligned} }
Step 3:: Determine the number of moles of KHC^8H^4O^4 that reacts with 0.00225 mol NaOH.
Since both reactants are in a 1:1 mole ratio, 0.00225 mol of KHC^8H^4O^4 reacts completely with 0.00225 mol of NaOH.
Step 4:: Calculate the mass of KHC^8H^4O^4 that reacts with 0.00225 mol NaOH.
Use the molar mass of KHC^8H^4O^4 (204.23 g/mol) to convert moles to grams: \boxed{ \begin{aligned} m_{\text{KHC^8H^4O^4}} &= n_{\text{KHC^8H^4O^4}} \times \text{Molar mass} \ &= 0.00225 \text{ mol} \times 204.23 \text{ g/mol} \ &= 0.462 \text{ g (rounded to three significant figures)} \end{aligned} }
Final Answer
The mass of KHC^8H^4O^4 that reacts with 15 mL of 0.15 M NaOH is 0.462 g.
Need Help with Homework?
Stuck on a difficult problem? We've got you covered:
- Post your question or upload an image
- Get instant step-by-step solutions
- Learn from our AI and community of students