Scelta multipla
To what final volume would 100 mL of 5.0 M KCl have to be diluted in order to make a solution that is 0.54 M KCl?
5297
views
7
rank
13. Solutions
Dilutions
2:02 minutiProblema 61
Domanda del libro di testo
You need 500. mL of a 5.0% (m/v) glucose solution. If you have a 25% (m/v) glucose solution on hand, how many milliliters do you need?
Guida verificata passo dopo passo1
Identify the initial and final concentrations and volumes: Initial concentration (C1) = 25% (m/v), Final concentration (C2) = 5.0% (m/v), Final volume (V2) = 500 mL.
Use the dilution formula: C1 * V1 = C2 * V2, where V1 is the volume of the 25% solution needed.
Rearrange the formula to solve for V1: V1 = (C2 * V2) / C1.
Substitute the known values into the equation: V1 = (5.0% * 500 mL) / 25%.
Calculate V1 to find the volume of the 25% glucose solution required.
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:
2mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Mass/Volume Percent Concentration
Mass/volume percent (m/v) concentration is a way to express the concentration of a solution. It is defined as the mass of solute (in grams) per 100 mL of solution. For example, a 5.0% (m/v) glucose solution contains 5 grams of glucose in 100 mL of solution, which is crucial for understanding how to prepare or dilute solutions.
Video consigliato:
Percorso guidato
00:38
Mass Percent Concept
Dilution Principle
The dilution principle states that when a concentrated solution is diluted, the number of moles of solute remains constant before and after dilution. This can be expressed with the formula C1V1 = C2V2, where C1 and V1 are the concentration and volume of the concentrated solution, and C2 and V2 are the concentration and volume of the diluted solution. This principle is essential for calculating how much of a concentrated solution is needed to achieve a desired concentration.
Video consigliato:
Percorso guidato
00:58Dilutions
Volume Calculation
Volume calculation involves determining the amount of a solution required to achieve a specific concentration. In this context, it requires using the dilution formula to find out how many milliliters of the 25% (m/v) glucose solution are needed to create 500 mL of a 5.0% (m/v) solution. Understanding how to manipulate the formula and perform unit conversions is key to solving such problems.
Video consigliato:
Percorso guidato
03:13Calculate Oxidation Numbers
Video correlati
Pratica correlata