Molar Concentration
Molar Concentration - Related Videos
01:54
Molar Mass
0 Views •
2020
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties. Atoms and molecules are extremely...
09:41
Concentration Dependence - Student Protocol
0 Views •
2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Concentration DependenceExpand In this experiment, you will combine varying concentrations of aqueous HCl and sodium thiosulfate to make solid sulfur, which rapidly gathers into opaque yellow particles at a certain sulfur concentration. Since the reaction solution starts clear and colorless, you can easily tell when it reaches that concentration. You'll use the same test tube and total volume each time, so it will take the same amount...
05:08
Concentration Dependence - Instructor Prep
0 Views •
2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of SolutionsExpand Here, we show the preparation of solutions for 10 students working in pairs, with some excess. Please adjust quantities as needed. Put on a lab coat, splash-proof safety glasses, and nitrile gloves. Obtain a waste container for aqueous sodium thiosulfate in advance. Note: HCl is toxic and highly corrosive, and sodium thiosulfate is an irritant, so the solutions for this lab must be prepared in a...
09:49
Solutions and Concentrations
0 Views •
2023
Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology A solution is a homogeneous mixture containing some components in small amounts, called solutes, and one component in a large amount, called the solvent. Solid-liquid solutions contain one or more solid solutes dissolved in a liquid solvent. Solutions are ubiquitous in chemistry: they are used to store and handle small amounts of material, carry out chemical reactions, and develop materials with controllable properties.
02:59
Solution Concentration and Dilution
0 Views •
2020
The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous...
FAQs
Molar concentration changes when either the solute amount or the total solution volume changes. Increasing the amount of solute while keeping volume fixed raises the value; increasing volume without adding solute lowers it. This dependence lets chemists compare solutions on a common basis and identify whether a concentration change comes from composition or dilution.
During dilution, the solute’s amount in moles stays constant even though the solution occupies more volume. Because concentration is recalculated after that volume change, the final value is lower than the initial value. The relationship C1V1 = C2V2 expresses this conservation and allows one unknown starting or final quantity to be calculated from the other three.
In stoichiometric calculations, concentration connects a measured solution volume with the amount of dissolved substance available for reaction. Multiplying concentration by volume gives the corresponding moles, provided the units are consistent. Chemists can therefore use solution measurements in reaction calculations rather than weighing every reacting portion, which supports quantitative comparisons between reactants.
To prepare a solution at a specified molar concentration, chemists first determine the required solute amount in moles from the target concentration and final volume. They then place that amount into a measured quantity of solvent, dissolve it, and adjust the total solution volume to the intended value. The final-volume step is essential because concentration uses solution volume.
To carry out a dilution, the needed volume of a more concentrated solution is obtained from C1V1 = C2V2. That portion is transferred and additional solvent is added until the final solution volume is reached. The calculation preserves the solute moles selected from the starting solution while producing the lower target concentration.
During titration, molar concentration helps convert the measured volume of one solution into moles, which can then be compared with the reacting amount of another substance. This relationship supports determination of an unknown solution concentration through stoichiometric calculations. The same control is valuable when chemists need reaction conditions to remain consistent in laboratory or industrial processes.