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2 years ago

Which pair of substances cannot form a buffered aqueous solution?

Chemistry

1 answer:

WARRIOR [948]2 years ago

5 0

HNO3 and NaNO3 cannot form a buffered aqueous solution from the following options.

A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.

Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many living systems that use buffering for pH regulation. For example, the bicarbonate buffering system is used to regulate the pH of bloodstream, and bicarbonate also acts as a buffer in the ocean.

Buffer solutions resist pH change because of a chemical equilibrium between the weak acid HA and its conjugate base A−:

HA ⇌ H⁺ + A⁻

Learn more about buffer solution here : brainly.com/question/8676275

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Can someone answer all 3 questions plz?

nordsb [41]

Question one should be obvious..

Mass can't be created not destroyed no matter what, so even in a chemical reaction, the answer will remain. The first answer is correct.

Question two

No, because even when water is broken down, there should only be one molecule of oxygen. The fact there is two means it's incorrect.

Question three

Yes. The equation is perfectly balanced on both sides, so it's safe to say the value of mass remains constant.

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3 years ago

Does adding coefficients to a chemical equation disobey the law of definite proportions? Explain your answer.

Temka [501]

Answer: No

Explanation:

- Law of definite proportions is a case from the Law of conservation of energy (matter) which states that "mass can neither be created nor destroyed, but changed from one form to another."

- Adding coefficients to a chemical equation confirms that there is the same number of atoms on both sides of a reaction; therefore, matter has not been created or destroyed but reorganized to give new substrates.

Example : 2 Mg + O2 → 2 MgO

In the balanced equation above, 2 moles of Mg reacts with 1 mole of O2 to produce 2 moles of MgO.

mass of 2 moles of Mg = 24×2= 48 grams

mass of 1 mole of O2 = 16+16 = 32 grams

total mass of reactants = 48 + 32 = 80 grams

mass of 2 moles of MgO = (24+16) ×2 = 80 grams

total mass of products = 80 grams

It is clear that the number of grams of matter before and after the reaction is the same and equals to 80 grams, so obeys the law of definite proportions..

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3 years ago

Moved mostly by wind and sometimes water, these constructive land features can be found on the coast and also in the desert. The

lidiya [134]

The answer would be B) Dunes. I hope you have a wonderful day :)

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4 years ago

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Paha777 [63]

Convection drives the earth's atmosphere and dictates the distribution of life in the world's oceans.

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3 years ago

Select the single best answer. Predict which of the following liquids has greater surface tension: ethanol (C2H5OH) or dimethyl

irina [24]

Answer:

Ethanol

Explanation :

The molecular structure of ethanol C2H5OH it is seen that there is a hydrogen atom attached to an oxygen atom, hence hydrogen bonding. This makes it has a greater surface tension than dimethyl ether.

Dimethy ether however has dipole moment in its structure. Dipole moments are said to be existent in a molecule when the charges are separated. This makes dimethyl ether have a lower surface tension. In the molecular tructure of dimethyl ether CH3OCH3) the oxygen atom is a negative atom in between two positive methyl group.

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3 years ago