**Molarity Definition**

Molarity (M) is defined as the number of moles of solute present in per liter of solution. In simple words, it tells the concentration of the solute in a solution. It is expressed by (M). It states how much moles of solute is present in the given solution.

**How to Calculate Molarity**

**Molarity Formula: **

Molarity = no. of moles of solute/liters of solution

**Molarity Units: **

Molarity units are �moles� which is denoted or written as (mols).

**Molarity Examples**

Here are a few examples :

- If there are 6 moles of Hydrochloric Acid (HCl) dissolves in one liter 1 Liter solvent so it becomes 6 molar HCl or 6 M HCl.
- If there are 0.05 moles of Sodium Chloride (NaCl) dissolves in 500 ml of a 0.1 M NaCl solution. The mole’s calculation of ions hinges with their solubility.
- If there are 0.1 moles of Na+ ions in one-liter solution it means it is 0.1 M NaCl aqueous solution.

**�****What is Osmolarity in Biology**

Osmolarity is basically the degree of how many solute osmoles are existing in 1 liter of a standard solution. The units of osmolarity are �osmols� (osm). Water will always move across a membrane into the solution with the higher osmolarity.

Erstwhile Osmolarity is taken alongside with term osmolality. Both they are interrelated to the measurement of osmoles� concentration within a solution. The primary difference between these two terms is that Osmolarity is the measurement of osmoles numbers within a liter of a solution, while Osmolarity measures the number of osmoles per kilogram (Osm/kg) of solvent. Both are written in terms of millimoles per kilogram (mmol/kg) in some instances.

**Osmolarity Calculation**

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**How to Calculate Osmolarity from Molarity?**

Here in the procedure given you can able to find out Osmolarity from Molarity. To find solutions� osmolarity you will have to find out molarity first. For the purpose to calculate Molarity utilize the following steps and find the Molarity (M) by using its formula.

**� 1**. Molecular weight is exhibit in Grams and due to which it is known as 1 Gram-Molecular Weight. It is Molecular weight of any sort of compound in Grams.

**1 Gram. Molecular Weight. = 1 mole.�**

For example, if 1 mole of Glucose = 180 grams Molecular Weight.

� �** 2.**� First of all, you have to know the exact Molecular. Weight of the solute, accurate volume of the solution, and how much solute is extant in that solution volume.

**3.**�1 mole of any compound comprises 6.02 x 10^{23 }�particles of that solute and this also represent the Avogadro�s Law.

**1 mole of solute per liter of solution =� 1 molar solution� =� 1 M.**

� **� 4.** To compute the Molarity of a solution, use the following equation:

���������������������������������������**� Amount of solute (in grams) per liter**

��������������������� ���**�M = —————————————————–**

�������������������������������������������������**����� Mol. Wt. of solute**

�** � 5.** After this, calculate the Osmolarity of a solution by using the following equation:

������������������������**� OSM (Osmolarity)� = M ( Molarity)� x Number of Particles of Dissociation.**

� � �**6.** For example: If NaCl compound is dissolved in water it dissociates into following two Ions (Na^{+} and Cl^{–}) and

**� � �7.** If we dissolve MgCl_{2} in water it dissociates into 3 ions (Mg^{++} and 2 Cl^{–}) one ion of Magnesium and two ions of Chloride.

**� � �8.** Lastly, our body fluids molarity is about 0.15 M and the osmolarity is about 0.3 Osm or 300 mOsm.

**� � �9.** Some ciphers which are frequently used like:

0.9 g % means = 0.9 grams per 100ml of solution (9 grams per liter)

� � � �0.1 g % means= 0.1 grams per 100ml (1 gram per liter)

5 % glucose solution means that 5 % of the weight of the solution is comprised of Glucose. 1 liter of water weighs is 1000 grams.

**� � 10.� **So, 0.05 x 1000 = 50 grams.

**� � 11.** Therefore a 5 % solution has 50 grams of solute dissolved in one liter.