Chemistry, 09.07.2019 16:20 dice50

0points what is [h3o +] in a solution made by dissolving 0.200 mole of sodium acetate (nach3coo) in enough water to make one liter of solution?

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well Na acetate dissolves in water to form a basic solution due to hydrolysis. The Aco-1 reacts with H2O to give HOAC and OH-1 according to the hydrolysis constant 1 x10^-14/1.8 X 10^-5 = 5.56 X 10^-10 X^2/0.1-X = 5.56 X 10^-10 X^2 = 5.56 X 10^-11 X = 7.46 X 10^-6=OH pOH = 6 - log 7.46 = 5.13 pH = 8.87 so the [H+] = 1.35 X 10^-9 M I do not know what is wrong with this answer... unless you gave pH and they wanted as you gave above the H+ concentration ( that would give that pH )check again... Proof [H+][OH-1]= 1 X 10^-14 (1.35 X 10^-9)( 7.46 x 10^-6 ) = 10.07 X 10 ^-15 = 1.07 X 10^-14 check

Answer from: Quest

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.

Answer from: Quest

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

$^{m}_{4}x$ and $^{m}_4y$

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

$^{m}_{5}x^{-}$

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be $^{9}_{5}be^{-}$ and $^{9}_{4}be$ .

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.

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