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2 years ago

Which of the compounds h2c2o4, ca(oh2, koh, and hi, behave as bases when they are dissolved in water?

2 answers:

6 0

H2C2O4, also written as (COOH)2, is Ethandioic acid, and, as evident by the name, is an acid, and not a base
Ca(OH)2 and KOH, Calcium Hydroxide and Potassium Hydroxide, respectively, are bases when dissolved in water, as they are able to release OH- ions.
Hydrogen Iodide, HI, when dissolved in water, is a strong acid. So, that is also not a base.

tatyana61 [14]2 years ago

5 0

Answer: The correct answer is $Ca(OH)_2\text{ and }KOH$

Explanation:

Acids are defined as the chemical species that produces hydrogen ions on dissolving in water.

Bases are defined as the chemical species that produces hydroxide ions on dissolving in water.

We are given:

Chemical compounds having chemical formulas $CH_3COOH,Ca(OH)_2,KOH\text{ and }HI$

$CH_3COOH$ is an organic acid and it produces $CH_3COO^-\text{ and }H^+$ ions

$Ca(OH)_2$ is a base and it produces $Ca^{2+}\text{ and }OH^-$ ions

$KOH$ is a base and it produces $K^{+}\text{ and }OH^-$ ions

HI is an acid because it produces $H^+\text{ and }I^-$ ions

Hence, the correct answer is $Ca(OH)_2\text{ and }KOH$

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A pH of 3 is how many times more acidic than a pH of 6?

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Answer:

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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound

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Answer: Ca3(PO4)2

Explanation:

We assume that the sample is 100.0 g.

The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.

Then we can calculate the number of moles of each component (n = m/atomic mass).

The number of moles of Ca = 38.7/40.078 = 0.96 mol.

The number of moles of P = 19.9/30.97 = 0.64 mol.

The number of moles of O = 41.2/15.99 = 2.75 mol.

Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).

Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.

To avoid the fraction of the ratios, we can multiply all ratios by 2.0.

Now, the ratio of Ca : P : O will be 3 : 2 : 8.

That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).

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2 years ago

The ground state configuration of fluorine is?

irinina [24]

the correct answer is b it makes the most sense

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2 years ago

A 1.40-L gaseous system absorbs 75 J of heat and expands its volume to 2.00 L against an external pressure of 1.02 atm. What is

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Answer:

15.24 J is the change in internal energy for this process.

Explanation:

According to the first law of thermodynamics:-

$\Delta U = q + w$

Where,

U is the internal energy

q is the heat

w is the work done

From the question,

q = + 75 J

(+ sign as the heat is being absorbed)

The expression for the calculation of work done is shown below as:

$w=-P\times \Delta V$

Where, P is the pressure

$\Delta V$ is the change in volume

From the question,

$\Delta V$ = 2.00 - 1.40 L = 0.60 L

P = 1.02 atm

$w=-1.02\times0.60\ atmL$

Also, 1 atmL = 101.3 J

So,

$w=-1.02\times0.60\times 101.3\ J=-59.76\ J$ (work is done by the system)

So,

$\Delta U = +75\ J-59.76\ J = 15.24\ J$

15.24 J is the change in internal energy for this process.

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