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olga2289 [7]
3 years ago
8

Why is the formation of ionic compounds exothermic?

Chemistry
1 answer:
bazaltina [42]3 years ago
6 0
TBH i dont know but can you give advice to get more points on this site 


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PbSO4 has a Ksp = 1.3 * 10-8 (mol/L)2.
Oduvanchick [21]

i. The dissolution of PbSO₄ in water entails its ionizing into its constituent ions:

\mathrm{PbSO_{4}}(aq) \rightleftharpoons \mathrm{Pb^{2+}}(aq)+\mathrm{SO_4^{2-}}(aq).

---

ii. Given the dissolution of some substance

xA{(s)} \rightleftharpoons yB{(aq)} + zC{(aq)},

the Ksp, or the solubility product constant, of the preceding equation takes the general form

K_{sp} = [B]^y [C]^z.

The concentrations of pure solids (like substance A) and liquids are excluded from the equilibrium expression.

So, given our dissociation equation in question i., our Ksp expression would be written as:

K_{sp} = \mathrm{[Pb^{2+}] [SO_4^{2-}]}.

---

iii. Presumably, what we're being asked for here is the <em>molar </em>solubility of PbSO4 (at the standard 25 °C, as Ksp is temperature dependent). We have all the information needed to calculate the molar solubility. Since the Ksp tells us the ratio of equilibrium concentrations of PbSO4 in solution, we can consider either [Pb2+] or [SO4^2-] as equivalent to our molar solubility (since the concentration of either ion is the extent to which solid PbSO4 will dissociate or dissolve in water).

We know that Ksp = [Pb2+][SO4^2-], and we are given the value of the Ksp of for PbSO4 as 1.3 × 10⁻⁸. Since the molar ratio between the two ions are the same, we can use an equivalent variable to represent both:

1.3 \times 10^{-8} = s \times s = s^2 \\s = \sqrt{1.3 \times 10^{-8}} = 1.14 \times 10^{-4} \text{ mol/L}.

So, the molar solubility of PbSO4 is 1.1 × 10⁻⁴ mol/L. The answer is given to two significant figures since the Ksp is given to two significant figures.

8 0
3 years ago
Ways of preventing rusting​
lesya [120]
Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. ...
Apply Oil. ...
Apply a Dry Coating. ...
Paint the Metal. ...
Store Properly. ...
Galvanize. ...
Blueing. ...
Powder Coating.
4 0
3 years ago
Read 2 more answers
Explain how the periodic table can help in writing electron configurations
Hoochie [10]
Period : the no. of electron shells
group: the last no. of electron configuration
4 0
3 years ago
Ben walks 500 meters from his house to the corner store. He then walks back toward his house but stops to talk to a neighbor whe
Arada [10]

Answer:

Average velocity = 0.3 m/s.

Explanation:

Given data:

Total distance from house to store = 500 m

Distance he traveled from store and stop before reached to house = 200 m  

Total time taken = 910 sec

Average velocity = ?

Solution:

Formula:

Average velocity = displacement / time

Displacement = distance from start - end point

Displacement = 500 m - 200 m = 300 m

Average velocity = 300 m/ 910 s

Average velocity = 0.33 m/s

Average velocity = 0.3 m/s.

7 0
2 years ago
____________ are composed of long chains of polymers that are tangled and can be easily pulled apart by the application of tensi
tiny-mole [99]

Answer:

a. Thermoplastics, Thermosetting polymers

5 0
3 years ago
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