Skip to main content
Ch.4 - Reactions in Aqueous Solution
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMcMurry 8th EditionCh.4 - Reactions in Aqueous SolutionProblema 102
Capitolo 4, Problema 102

Potassium permanganate (KMnO4) reacts with oxalic acid (H2C2O4) in aqueous sulfuric acid according to the follow-ing equation: How many milliliters of a 0.250 M KMnO4 solution are needed to react completely with 3.225 g of oxalic acid?

Guida verificata passo dopo passo
1
Write the balanced chemical equation for the reaction between potassium permanganate (KMnO_4) and oxalic acid (H_2C_2O_4) in acidic solution: \[ 2 \text{KMnO}_4 + 5 \text{H}_2\text{C}_2\text{O}_4 + 6 \text{H}_2\text{SO}_4 \rightarrow 2 \text{MnSO}_4 + 10 \text{CO}_2 + 8 \text{H}_2\text{O} + K_2\text{SO}_4 \]
Calculate the moles of oxalic acid (H_2C_2O_4) using its molar mass: \[ \text{Moles of } H_2C_2O_4 = \frac{\text{mass of } H_2C_2O_4}{\text{molar mass of } H_2C_2O_4} \]
Use the stoichiometry of the balanced equation to find the moles of KMnO_4 needed. According to the equation, 2 moles of KMnO_4 react with 5 moles of H_2C_2O_4. Therefore, \[ \text{Moles of KMnO}_4 = \frac{2}{5} \times \text{moles of } H_2C_2O_4 \]
Calculate the volume of the 0.250 M KMnO_4 solution required using the formula: \[ \text{Volume (L)} = \frac{\text{moles of KMnO}_4}{\text{molarity of KMnO}_4} \]
Convert the volume from liters to milliliters by multiplying by 1000.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It allows us to calculate the amounts of substances consumed and produced in a reaction based on balanced chemical equations. Understanding stoichiometry is essential for determining how much of one reactant is needed to completely react with another.
Video consigliato:
Percorso guidato
01:16
Stoichiometry Concept

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in units of moles per liter (M). In this problem, the molarity of the KMnO4 solution is crucial for calculating how many moles of KMnO4 are present, which can then be used to find the volume needed to react with a given mass of oxalic acid.
Video consigliato:
Percorso guidato
01:13
Molarity

Balancing Chemical Equations

Balancing chemical equations is the process of ensuring that the number of atoms for each element is the same on both sides of the equation. This is important because it reflects the conservation of mass in a chemical reaction. For this question, knowing the balanced equation for the reaction between potassium permanganate and oxalic acid is necessary to determine the stoichiometric ratios needed for the calculations.
Video consigliato:
Percorso guidato
01:32
Balancing Chemical Equations
Pratica correlata
Domanda del libro di testo
The odor of skunks is caused by chemical compounds called thiols. These compounds, of which butanethiol (C4H10S) is a representative example, can be deodorized by reaction with household bleach (NaOCl) according to the following equation: according to the following equation? How many grams of butanethiol can be deodorized by reac-tion with 5.00 mL of 0.0985 M NaOCl?
717
views
Domanda del libro di testo
A flask containing 450 mL of 0.500 M HBr was accidentally knocked to the floor. How many grams of K2CO3 would you need to put on the spill to neutralize the acid according to the following equation?
603
views
Domanda del libro di testo

How many milliliters of 1.00 M KOH must be added to neutralize the following solutions? (a) A mixture of 0.240 M LiOH (25.0 mL) and 0.200 M HBr (75.0 mL)

652
views
Domanda del libro di testo

Write balanced net ionic equations for the following reactions. Note that HClO3 is a strong acid. (b)

478
views
Domanda del libro di testo
Oxalic acid, H2C2O4, is a toxic substance found in spinach leaves. What is the molarity of a solution made by dissolving 12.0 g of oxalic acid in enough water to give 400.0 mL of solution? How many milliliters of 0.100 M KOH would you need to titrate 25.0 mL of the oxalic acid solution according to the following equation?
774
views
Domanda del libro di testo

How many milliliters of 1.00 M KOH must be added to neutralize the following solutions? (b) A mixture of 0.300 M HCl (45.0 mL) and 0.250 M NaOH (10.0 mL)

1140
views