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How to calculate molarity (article) | Khan Academy We often want to be able to quantify the amount of a species that is in the solution, which is called the concentration of that species In this article, we'll look at how to describe solutions quantitatively, and discuss how that information can be used when doing stoichiometric calculations
Dilutions (video) | Molarity | Khan Academy Dilution is the process of lowering the concentration of a solution by adding solvent This process is important for preparing solutions of precise concentrations for experiments The dilution equation (M1*V1) = (M2*V2) is used to calculate the molarities and volumes required for the dilution
Acid–base titrations (video) | Khan Academy If we know the moles of our analyte and the original volume of the analyte, we can now calculate the concentration of the analyte solution in molarity that we began with which is the objective of a titration
Molarity calculations (practice) | Khan Academy A 0 674 M cobalt (II) chloride (CoCl 2 ) solution is prepared with a total volume of 0 0750 L The molecular weight of CoCl 2 is 128 9 g mol What mass of CoCl 2 (in grams) is needed for the solution? Express the answer using 3 significant figures
Molarity vs. molality (video) | Khan Academy Learn how molarity and molality differ! The molality of a solution is equal to the moles of solute divided by the mass of solvent in kilograms, while the molarity of a solution is equal to the moles of solute divided by the volume of solution in liters
Determining solute concentration by acid–base . . . - Khan Academy First, calculate the number of moles of strong base required to reach the equivalence point of the titration Then, using the mole ratio from the balanced neutralization equation, convert from moles of strong base to moles of acid
Molarity (video) | Solutions and mixtures | Khan Academy The most common way to express solution concentration is molarity (M), which is defined as the amount of solute in moles divided by the volume of solution in liters: M = moles of solute liters of solution
Worked example: Calculating the pH after a weak acid–strong base . . . When a strong base reacts with excess weak acid, the resulting solution contains both HA and A⁻ We can use reaction stoichiometry to determine the concentration of each species and then solve a common-ion equilibrium problem to find [H₃O⁺] and thus the pH
pH, pOH, and the pH scale (article) | Khan Academy Step 2: Calculate molarity of H + after dilution The molarity of the diluted solution can be calculated by using the moles of H + from the original solution and the total volume after dilution
Dilution (video) | Solutions and mixtures | Khan Academy Together a solute and a solvent are called a solution So if you have a glass of salt water, you have a solution of water where the water is the solvent and the salt is the solute If you have a lot of salt in the water then it is a concentrated solution which we would express with a large molarity