Let's understand what is volume?

Measurement has become an everyday activity, which involves many things that we always do. Like buying a packaged juice, buying a liter of softener or measuring the ingredients to make a cake to celebrate. It is also very important in laboratories, in masonry, in pharmacy. They all relate to the amount of liquid that can be contained in any container, that is why you should read the written let's understand what is volume?

Definition

Refers to the space occupied by a liquid inside a container. It should not be confused with capacity since this is the maximum amount of material that a container or instrument can contain. The unit of capacity is the liter at this point it must be remembered that there are multiples and submultiples in the units and that the milliliter is one more of them.

Determination of the volume of a material

It is executed by the use of graduated instruments, the capacity should be chosen according to according to the volume to be measured. It it can measure the volume of a solid, liquid, gaseous material. The volume of a liquid, is determined by placing the liquid directly into the container corresponding. The volume reading is performed taking into account the position of the meniscus. Whose shape can be concave or convex. The volume of a solid is determined in two ways: If it is a regular solid, by means of a geometric figure.

If it is an irregular solid, a solid with no definite shape, the volume is determined using the water displacement method. The solid gets inside the container where the volume of water increases. The volume of the solid is know by difference. The volume of a gas, is determined by displacement of water. For this you have to collect the gas in a container completely filled with water upside down inside another. Passing through the container by a hose that it connects to the gas.

It displaces the amount of water equal to the volume it occupies. The molar volume states that one mole of any gas under normal conditions is 1 atmosphere. It occupies a volume of 22.4 liters, contains 6.02×10-23 gas molecules the legal basis says that at constant temperature and pressure. The gas is proportional to the volume.

Formulas for calculations

For regular solids: THE cube= the base raised to the exponent three, the rectangle= the multiplication of the base. The height and width, the cylinder= pi times the height by the radius squared, the sphere= four times fraction three times pi by the radius increased to three. For irregular solids: vol(solid) = vol(water + solid) - vol(water).

Volume units in chemistry are based on the international system of measurements. They are derived units that serve to transform the units from multiple to submultiple or vice versa, which are.: Kiloliter, hectoliter, decaliter, liter, centiliter, deciliter, milliliter. An example is to transform 1ooo g to kg, where it turns out 1000 out of 1000kg giving as an answer 0.1 kg.

Volume exercises chemistry

From unit transformation: transform 0.25 kg to grams. Then 0.25 x 1000 grams obtaining 250 grams. Of regular solids Which is the amount of water that a container measuring 30 cm long, 30 cm wide and 25 cm high can contain.

Data: V(water)=?. L= 30cm, W= 30cm, h=25cm. So 30x30x25=22500
being the V(water) = 22500 cubic cm.

Of irregular solids: What will be the volume of a piece of iron which, introduced into a graduated cylinder contains 25 ml of water, its volume increases to 80 ml.

V= Final Vol - initial vol where V= 80 ml – 25 ml, V= 55 ml.

Concentration of solutions:

20 ml of ethyl alcohol is dissolved in 500 ml of water.
What is the concentration of the solution?

So %v/v = 20 ml per 100 divided by 500 ml, where
%v/v = 4

A solution of sodium chloride has 15 grams dissolved in650 ml of solution. Say concentration. %m/v= 15 times 100 divided by 560= 2,68.

What is density?

It consists in the ratio of mass to the amount of liquid, the more contained in a unit volume, the greater the amount of matter the higher the density. It is useful to identify the substances why such a ratio is constant at constant temperature and pressure, its formula is D= m/v expressed in units g/cm3 and g/l.

Percentage concentration

The quantitative concentration of a solution can be expressed in percentage terms. Indicates the amount of solute dissolved by every hundred parts of dissolution. It can be expressed in m/m, v/v, v/m here we will address those that refer to the volume. The volume-volume percentage. v/v.

Expresses the volume in cubic centimeters of solute in 100 cm3 of solution, its formula in:

% v/v = amount of the solute in cubic centimeters divided by the amount of the solution in cubic centimeters x one hundred.

% m/v = mass of solute in grams divided by the amount of the solution x 100.

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