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2 years ago

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What is the definition of the word: Property (the scientific definition A makes up matter; makes up the world around us B an obj

ect or diagram C something that can be observed about a substance D to change the position of something HEalPPPPPPpPP

1 answer:

IRISSAK [1]2 years ago

4 0

Answer:

i feel like the answer is A

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It is desired that an acetic acid sodium acetate buffered solution have a pH of 5.27. You have a solution that has an acetic aci

SVETLANKA909090 [29]

Answer:

0.034 M is the molarity of sodium acetate needed.

Explanation:

The pH of the buffer solution is calculated by the Henderson-Hasselbalch equation:

$pH = pK_a + \log \frac{[A^-]}{[HA]}$

Where:

pK_a= Negative logarithm of the dissociation constant of a weak acid

$[Ac^-]$ = Concentration of the conjugate base

[HA] = Concentration of the weak acid

According to the question:

$HAc(aq)\rightleftharpoons Ac^-(aq)+H^+(aq)$

The desired pH of the buffer solution = pH = 5.27

The pKa of acetic acid = 4.74

The molarity of acetic acid solution = [HAc] = 0.01 M

The molarity of acetate ion = $[Ac^-] = ?$

Using Henderson-Hasselbalch equation:

$5.27= 4.74 + \log \frac{[Ac^-]}{[0.01 M]}$

$[Ac^-]=0.0339 M\approx 0.034M$

Sodium acetate dissociates into sodium ions and acetate ions when dissolved in water.

$NaAc(aq)\rightarrow Na^+(aq)+Ac^-(aq)\\$

$[Ac^-]=[Na^+]=[NaAc]= 0.034M$

0.034 M is the molarity of sodium acetate needed.

3 0

2 years ago

Zinc is used as a coating for steel to protect the steel from environmental corrosion. If a piece of steel is submerged in an el

sweet [91]

Answer:

A) 3.17 g of Zn

Explanation:

Let's consider the reduction of Zn(II) that occurs in an electrolysis bath.

Zn⁺²(aq) + 2e⁻ → Zn(s)

We can establish the following relations:

1 min = 60 s
1 A = 1 C/s
The charge of 1 mole of electrons is 96,468 C (Faraday's constant).
When 2 moles of electrons circulate, 1 mole of Zn is deposited.
The molar mass of Zn is 65.38 g/mol

The mass of Zn deposited under these conditions is:

$24min \times \frac{60s}{1min} \times \frac{6.5C}{s} \times \frac{1mol\ e^{-} }{96,468C} \times \frac{1molZn}{2mol\ e^{-}} \times \frac{65.38g}{1molZn} = 3.17 g$

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2 years ago

What charge is there on a lithium ion?

gogolik [260]

Lithium is in the Alkali Metal group or 1A column. The atoms in this group form ions with a 1+ charge. Lithium ion’s charge is 1+.

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You used a calorimeter in the heat transfer lab. Explain how the calorimeter works, and how to calculate the heat given off or a

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A calorimeter contains reactants and a substance to absorb the heat absorbed. The initial temperature (before the reaction) of the heat absorbent is measured and then the final temperature (after the reaction) is also measured. The absorbent's specific heat capacity and mass are also known. Given all of this data, the equation:
Q = mcΔT
To find the heat released.

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3 years ago

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Which substance can be decomposed by chemical means?

sweet-ann [11.9K]

Are u sure this is the right option? Well, antimony can be decomposed. Including octane.

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2 years ago