Noyes whitney equation

How do you calculate the rate of dissolution?

a) Calculate the dissolution rate constant (K = D/h) case 1 dM/dt =KS (Cs-Ct) = (0.000336 cm /sec)(5000 cm2)(15- 1.52 mg/ml) dM/dt = 22.646mg/sec case 2 dM/dt =KS (Cs) = (0.000302 cm /sec)(5000 cm2)(15mg/ml) dM/dt = 22.65 mg/sec case 1: not sink condition dM/dt =KS (Cs-Ct) dM/dt =0.76gm / 60 seconds = 0.01267 gm/sec X

What is the dissolution rate?

The dissolution rate is a measure of the actual release rate of the compound at the given particle size etc. in an aqueous media. It often vary considerably with solid form, e.g. particle size and shape (read more about dissolution theory).

What is the difference between solubility and dissolution rate?

Dissolution is a kinetic process, and is quantified by its rate. Solubility quantifies the dynamic equilibrium state achieved when the rate of dissolution equals the rate of precipitation. Solubility is a chemical property referring to the ability of a given substance, the solute, to dissolve in a solvent.

What are 3 factors that affect the rate of dissolution?

The rate of dissolving depends on the surface area (solute in solid state), temperature and amount of stirring.

How is drug release calculated?

Amount of drug released mg/ ml = Concentration × Dissolution bath volume × dilution factor/1000.

Why dissolution is performed on 6 tablets?

Dissolution test is done to verify the release of drug in the solution from the tablet because of binders, granulation, mixing and the coating may affect the release of drug from tablets. Dissolution test is done using 6 units or dosage forms.

How many types of dissolution are there?

The dissolution test. It is worth reviewing the dissolution test, its historical evolution and some of its significant limitations. The various different pharmacopoeias describe four main types of dissolution apparatus; one (basket), two (paddle), three (reciprocating cylinder and four (flow through) (USP<711>).

What is the principle of dissolution?

Tablet Dissolution is a standardised method for measuring the rate of drug release from a dosage form and the key word here is “standardisation” because for any results to be meaningful, it is essential that all the apparatus used for the testing, produces the same sets of results given all other parameters are equal.

What solute means?

the substance dissolved in a given solution.

How does temperature affect dissolution rate?

Temperature. Heating up the solvent gives the molecules more kinetic energy. The more rapid motion means that the solvent molecules collide with the solute with greater frequency and the collisions occur with more force. Both factors increase the rate at which the solute dissolves.

What is a dissolving?

Some substances dissolve when you mix them with water. When a substance dissolves, it might look like it has disappeared, but in fact it has just mixed with the water to make a transparent (see-through) liquid called a solution. Substances that dissolve in water are called soluble substances.

What are 3 ways to speed up dissolving?

Terms in this set (3)Stirring. Brings more solvent in contact with solute.Heating. Speeds up particles causing them to bump and break, further exposing them to the solvent.Increasing surface area. By crushing or breaking the solid, you are exposing it to more contact with the solute.

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What are 3 ways to dissolve a solid faster?

There are three ways to make solids dissolve faster: Break the solute into smaller pieces. Stir the mixture. * Heat the mixture.

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