3. suppose you wish to extract 10 g of benzoic acid from an ether solution with aqueous nahco3. (a) write the equation for the reaction of benzoic acid and nahco3 (b) what is the minimum amount of nahco3 that must be added to 50 ml of water to carry out the extraction?

The minimum amount is 6,9 g

Explanation:

The extraction of benzoic acid with aqueous NaHCO₃ is an Acid-Base Reaction, where the benzoic acid loses a proton to the sodium bicarbonate, as follows:

(a)  Ф-COOH + NaHCO₃   ↔ Ф-COO⁻ + NaH₂CO₃⁺

In order to calculate the amount of bicarbonate needed, some conversion factors need to be used:

10 g acid *  

Thus, 6,9 g of sodium bicarbonate would need to be added in order to extract 10 g of benzoic acid

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-