NaOH has the property of deliquescent hence it cannot be weighed directly instead a saturated solution is diluted and desired concentration is obtained.
Explanation:
Sodium hydroxide undergoes deliquescent.
Deliquescence is the process in which substance absorbs moisture and carbon dioxide from the atmosphere to the extent of getting dissolved and form a solution.
Deliquescence happens when vapour pressure of solution formed is less than the partial pressure of water vapour in the air.
This is the reason that student did not measure the sodium hydroxide directly as the weight will change and proper solution cannot be made. Because of the deliquescence standard solution of NaOH is not prepared.
The student made a solution without weighing the NaOH instead she prepared a solution till the NaOH got dissolved and then diluted the solution.
Answer:
A dichotomous key is a tool that allows the user to determine the identity of items and organisms in the natural world. ... In each step, the user is presented with two statements based on characteristics of the organism. If the user makes the correct choice every time, the name of the organism will be revealed at the end
Explanation:
Transportation is the movement of food substances (sugars) from the stems to growing tissues and storage tissues.
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Air mass is how much matter is in air. Front is the side that something faces forward with.
Answer:
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Explanation:
Normally, in the neutralization reactions, that is how the reactions between and acid and a base are called, you assume additive volumes.
Additive volumes means that the <em>volume</em> of the final <em>solution</em> is equal to the sum of the separate volumes of the two solutions that are mixed.
It is not totally accurate, but it is a good approximation and for lack of additional data it is what is used.
Then, assuming additive volumes:
- Total volume of the solution = 100 mL + 250 mL = 350 mL.