Question

How is $ 1 $ molar $ NaOH $ different from $ 1 $ molar $ NaOH $ .

Answer 1

Hint: Molar and molar are two different things. The difference can be observed after the conversion of both quantities into the gram. So, first, we need to convert $ 1 $ molar $ NaOH $ into grams and then define $ 1 $ molar $ NaOH $ . After that compare both quantities to figure out the difference.

Complete answer:
First, we need to convert the $ 1 $ mole $ NaOH $ into grams –
The molar weight of sodium is $ 23g $ and the molar weight of oxygen is $ 16g $ whereas the molar weight of hydrogen is $ 1g $ . This makes the molar weight of sodium hydroxide - $ 16g + 23g + 1g = 40g $ which means that one mole of sodium hydroxide will contain $ 40g $ weight.
Now, we need to define the $ 1 $ molar $ NaOH $ –
The molar weight of sodium is $ 23g $ and the molar weight of oxygen is $ 16g $ whereas the molar weight of hydrogen is $ 1g $ . This makes the molar weight of sodium hydroxide - $ 16g + 23g + 1g = 40g $ which means that one mole of sodium hydroxide will contain $ 40g $ weight.
Now, this one mole or $ 40g $ of sodium hydroxide can be dissolved in $ 1000 $ milliliters of water to obtain $ 1 $ molar $ NaOH $ solution.
Hence, we can conclude that $ 1 $ mole $ NaOH $ is the quantity of $ 40g $ of sodium hydroxide while $ 1 $ molar $ NaOH $ is the concentration in which $ 40g $ of sodium hydroxide will be dissolved in $ 1000 $ milliliters of water. Simply, $ 1 $ mole $ NaOH $ is quantity and $ 1 $ molar $ NaOH $ is concentration.

Note:
The concentration of the solution can be expressed in many ways like molality, molarity, percent by mass or volume, part per million or billion, etc. $ 1 $ molar solution means that it contains $ 1 $ gram molar weight of solute dissolved in $ 1 $ litre of the solvent. In simple words, the difference between mole and molar is that mole represents amount while molar represents concentration.