Skip to main content

What is molarity

What is molarity?

It is the most broadly utilized unit and is indicated by M. Molarity is characterized as the quantity of moles of the solute in 1 liter of the arrangement.Thus,
Molarity (M)=No. of moles of solute  
 Volume of solution in litre

Example,
1) 5 moles of solute present in 500ml of solution,what is molarity?
Answer- Molarity (M)= 5 moles
                                            0.5 ltr
                                       = 5 × 10
                                               5
                                       = 10M
(Explained, 500 ml solutions means in litre is 0.5 ltr.)

Calculation of Molarity

For example,
1) 80 gm of NaoH present in 400 ml solution, What is Molarity?
Answer - moles of NaoH = 80 gm     
                                                40 moles
                                             = 2 moles
                       Molarity (M) = 2 moles
                                                  0.4 litre
                                               = 2×10
                                                    4
                                                = 5 M
(Explained, first we find moles of solute formula is,  moles of solute = weight of solute               )
                                     Molecular mass of solute)

Calculation for molarity

For mixing solutions, 
1) 500 ml of 1M sugar solution mix with 1 litre of 2M sugar solution?
Answer- Molarity= Total solute moles           
                                   Total volume of solution
First we find,[1] number of moles of solute
500 ml of 1M sugar solution,(A)=B× C
                                                          = 1×0.5 =0.5
 500 ml of 2M sugar solution,(A)=B×C
                                                          = 2×1= 2
 Molarity= Total solute moles           
                    Total volume of solution
                =(2+0.5) moles
                    1.5 litre
                  = 2.5
                      1.5   
                 = 1.67 M
(A= number of moles of solute, B = Molarity
 C = volume of solution in litre)

 General expression to find molarity when similar solutions are mixed=
General expression=
M1,V1,L.                  M1V1+M2V2+M3V3+---------- 
M3,V2 L Resultant V1+V2+V3+---------
M3,B3 L molarity



Labels:

Comments

Post a Comment

Please do not enter any spam link in the comment box

Popular posts from this blog

stoichiometry

Introduction to stoichiometry The word ‘ stoichiometry ’ is derived from two Greek words - stoicheion (meaning element) and metron (meaning measure). Stoichiometry is the study of numerical relationship between the amounts of reactants used and amounts of products formed by a chemical reaction. Stoichiometry is based on the law of conservation of mass and the mass of reactants equals the mass of the products. Why do we use this? Stoichiometry problems consist of predicting the amount of gram of product that will form from a reaction.if you know how many grams of reactants you have predicting the number of gram of reactant that will be needed to produce a certain amount of product. How can stoichiometry be used in real life? Let's we start this, stiochiometry can be used in cooking. We going start baking a butter cake, for baking a butter cake needed some ingredient like flour,butter,suger,eggs for bake a nice and tasty butter cake. all this ingredient requi...
Post a Comment
Read more

PROPERTIES OF MATTER AND THEIR MEASUREMENT

PROPERTIES OF MATTER & THEIR MEASUREMENT   Properties of matter & their measurement are divided in Physical and chemical properties . Every substance has unique or characteristic  properties. These properties can be classified  into two categories — physical properties ,  such as colour, odour, melting point, boiling point, density, etc., and chemical properties , like composition, combustibility, ractivity with acids and bases, etc.  Physical properties can be measured or observed without changing the identity or the composition of the substance. The measurement or observation of chemical properties requires a chemical change to occur. Measurement of physical properties does not require occurance of a chemical change. The examples of chemical  properties are characteristic reactions of different  substances; these include acidity or basicity,  combustibility, etc. 1)   Mea...
Post a Comment
Read more

Can we drink lemon water with salt everyday?

  Can we drink lemon water with salt everyday?   1) we'll see the benefits of lemon and benefits of drinking lemon water early in the morning Every day on an empty stomach Lemon is one of the fruit, in the citrus fruit Lemon is a fruit which is best knows for its sour taste. 2)  Lemon has various health benefits for both children and adults When Lemons are ripe, the outer layer would turn yellow in colour And it offers good amount of juice with little seeds Lemons are very popular in the Mediterranean Cuisines as a beautiful addition to their salads Lemons are one of the best fruits which are to be taken during summers The juice of Lemon is ideal in helping recover from the hot sun and hydrates the whole body The juice not only hydrates our body, but also supplies essential vitamins and minerals . 3)  Studies have shown that you can lower the Glycemic Index /GI of a meal by 20 to 40% Just by adding a few teaspoons of lemon juice to your meal. Glycemic Index refers to...
Post a Comment
Read more