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krek1111 [17]
3 years ago
6

1J /(g*C), 1*C, 1 J, m=g

Chemistry
1 answer:
Nostrana [21]3 years ago
7 0
You can find the answer on google for this
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Why was it necessary to make sure that some solid was present in the main solution before taking the samples to measure Ksp?
padilas [110]

The question is incomplete, the complete question is;

Why was it necessary to make sure that some solid was present in the main solution before taking the samples to measure Ksp? Select the option that best explains why. Choose... A. To make sure no more sodium borate would dissolve in solution. B. To ensure the dissolution process was at equilibrium. C. To make sure the solution was saturated with sodium and borate ions. D. All of the above

Answer:

B. To ensure the dissolution process was at equilibrium.

Explanation:

The solubility product is a term used in chemistry to describe the equilibrium between the dissolved, dissociated and undissolved solute of a relatively low solubility ionic solid.

For an ionic solid MX, the solubility product is given as ;

MX(s) ----> M^n+(aq) + X^n-(aq)

If Ksp indeed scribes an equilibrium process for dissolution, it then implies that some undissolved solute must be present before samples are taken to measure the Ksp of a sample. This ensures equilibrium between dissolved and undissolved solute.

7 0
3 years ago
How many hydrogen(H) atoms are on the reactants side <br><br> A.2<br> B.6<br> C.12<br> D.6
cluponka [151]
I’m pretty sure it’s c
5 0
2 years ago
What are the factors affecting your limitations? How about possibilities?
Charra [1.4K]

Explanation:

My physiological make-up that governs the attributes I have and my climate, i.e. the conditions I have, are the variables influencing my limits. Biological make-up also regulates my prospects when they depend on my attributes, i.e. my ability and my environment , i.e. the conditions under which I am. This has been shown by experiments on twins, that our limits and opportunities are controlled by both genetics and environment.

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3 years ago
Which of the following would be an example of a trophic relationship? Select all that apply.
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Small marine life feeding on the algae and plankton that have descended to the ocean floor
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What mass of sodium benzoate should be added to 160.0 ml of a 0.17 m benzoic acid solution in order to obtain a buffer with a ph
Scorpion4ik [409]

Answer :

The mass of sodium benzoate that can be added to benzoic acid is 5.07 g

Explanation :

The problem can be solved with the help of Henderson-Hasselbalch equation.

Step 1 : Find concentration of sodium benzoate

The equation is given below.

p^{H} = p^{Ka} + log \frac{[Base]}{[Acid]}

We have been given,

pH = 4.30

[Acid] = 0.17 M

Ka of benzoic acid can be found out using standard reference table which is 6.5 x 10⁻⁵

pKa = - log (Ka)

pKa = - log (6.5 x 10⁻⁵)

pKa = 4.19

Let us plug in the above values in Henderson equation.

4.30 = 4.19 + log \frac{[Base]}{(0.17M)}

0.11 = log \frac{[Base]}{0.17}

10^{0.11} = 10^{log \frac{[Base]}{0.17}}

The functions 10^{log} cancel out each other.

10^{0.11} = \frac{[Base]}{0.17}

1.29 = \frac{[Base]}{0.17}

[Base] = 0.22 M

The base in this case is sodium benzoate.

Therefore concentration of sodium benzoate is 0.22 M.

Step 2 : Find moles of sodium benzoate

The volume of the solution is 160 mL.

Volume in L = 160 mL\times \frac{1L}{1000mL}= 0.16 L

Moles of sodium benzoate can be found as,

mole=concentration \times volume(L)

mole=0.22 mol/L \times 0.16 L

mole=0.0352 mol

Moles of sodium benzoate are 0.0352

Step 3 : Find mass of sodium benzoate

Mass of sodium benzoate can be calculated as

Mass in grams = Moles x Molar mass

The formula of sodium benzoate is C₇H₅O₂Na.

Molar mass of sodium benzoate = 7 x 12.01 + 5 x 1.01 + 2 x 16 + 22.98

Molar mass of sodium benzoate = 144.1

Mass of sodium benzoate = 0.0352 mol \times  144.1 \frac{g}{mol}

Mass of sodium benzoate = 5.07 g

5.07 grams of sodium benzoate should be added to the given volume of benzoic acid.

5 0
3 years ago
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