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3 years ago

Is this solution saturated or unsaturated? How can you tell? the solution is strontium and phosphate mixed in water

1 answer:

3 0

If you continued to add the solute to the solution, the solute will not dissolve any more. Then the solution is saturated. If it will dissolve. it is unsaturated.

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What will be the ph of a buffer solution containing an acid of pka7. 5, with an acid concentration exactly one fourth of that of

Lilit [14]

The pH of a buffer solution containing acid of pKa 7.5 will be 8.1.

The pH of a solution indicates its acidity or basicity. A pH below 7 is acidic, while pH above 7 is basic. 7 is considered as the neutral value.

A buffer is a solution that has the ability to resist the change in pH when an acid or a base is added to it. The natural example of buffer is blood.

According to the question, pKa of acid = 7.5

If concentration of base is x then, concentration of acid will be x/4.

According to the Henderson–Hasselbalch equation,

pH = pKa + log [A⁻] / [HA]

pH = 7.5 + log [ $\frac{x}{x/4}$ ]

pH = 7.5 + log 4 ⇒ 7.5 + 0.602

pH = 8.1

To know more about buffer, here

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5 0

2 years ago

Please help me for question 1 and 2

likoan [24]

Answer:-

1) 6 mol

2) Mo

Explanation: -

Mass of Ozone = 48 g

Chemical formula of ozone = O3

Molar mass of Ozone O 3 = 16 x 3 = 48 g mol-1

Number of moles of ozone = Mass / molar mass

= 48 g / 48 g mol-1

= 1 mol

According to Avogadro’s law, 1 mole of a substance has 6.02 x 10^ 22 molecules.

So 1 mol of O3 has 6.02 x 10^ 22 molecules of ozone.

Now each Ozone molecule has 3 atoms of oxygen.

So, 1 mol of ozone has 3 x 6.02 x 10^22 atoms of oxygen.

Sodium must have 2 x 3 x 6.02 x 10^22 atoms as per the question.

According to Avogadro’s law, 6.02 x 10^ 22 atoms are in 1 mol of sodium

So, for 2 x 3 x 6.02 x 10^22 atoms, there should be (1/ 6.02 x 10^ 22) x 2 x 3 x 6.02 x 10^22

= 6 mol of sodium.

Let the mass of M be m g

Formula of hexafluoride = MF6.

Mass of the hexafluoride = g + 6 x 19

= m + 114

Mass of M=0.250g

Moles of M = 0.250/m

Mass of MF6= 0.547g

Moles of MF6 = 0.547/ (m + 114)

We know 1 mole of M gives 1 mole of MF6.

0.250/m moles of M gives 0.250/m moles of MF6.

But number of moles of MF6 = 0.547/ (m + 114)

Thus

0.250/m = (0.547)/ (m +114))

0.250m + 0.250 x 114 = 0.547m

m = 0.250 x 114 / (0.547 -0.250)

= 96

We see from the given data that Mo is 96.

So M is Mo.

4 0

3 years ago

10. i really really need help plz don't waste time, thx :)

egoroff_w [7]

Lollll lollll lolll lolll

6 0

3 years ago

Read 2 more answers

How does evelyn hear music?

olga_2 [115]

Who even is Evelyn?

4 0

3 years ago

A. Indicate whether the following descriptions refer to electrolytes or to non-electrolytes.

Leokris [45]

Answer:

1.non electrolytes

2.electrolytes

3.non electrolytes

4.electrolytes

5.electrolytes

6.electrolytes

Explanation:

electrolytes are substance in their molten form which can be decomposed by the passage of electricity exay includes acids,base and salts etc were as non electrolytes cannot be decomposed by the passage of electricity example alcohol,sugar organic solvents etc. Electrolytes in the body like potassium, sodium in their molten form helps to keep the electrical circuitry of the heart well

7 0

3 years ago