Answer:

Explanation:
Hello,
At first, the answer is wrong, consider the following procedure:
- the pKs, leads to a Ks of:


- now, stating the equilibrium for the calcium sulfate (whereas x is the change during the equilibrium):
![Ks=[Ca^{+2}]^{eq}[SO_{4}^{-2}]^{eq}\\Ks=[x]^{eq}[x]^{eq}\\Ks=x^{2}\\x=\sqrt{2.63x10^{-5}}\\x=5.13x10^{-3} M](https://tex.z-dn.net/?f=Ks%3D%5BCa%5E%7B%2B2%7D%5D%5E%7Beq%7D%5BSO_%7B4%7D%5E%7B-2%7D%5D%5E%7Beq%7D%5C%5CKs%3D%5Bx%5D%5E%7Beq%7D%5Bx%5D%5E%7Beq%7D%5C%5CKs%3Dx%5E%7B2%7D%5C%5Cx%3D%5Csqrt%7B2.63x10%5E%7B-5%7D%7D%5C%5Cx%3D5.13x10%5E%7B-3%7D%20M)
- x becomes the concentration of calcium ions and one of the contributions for the total concentration of sulfate ions, thus:
![[Ca^{+2}]^{eq}=5.13x10^{-3} M](https://tex.z-dn.net/?f=%5BCa%5E%7B%2B2%7D%5D%5E%7Beq%7D%3D5.13x10%5E%7B-3%7D%20M)
- finally, since the sodium sulfate is totally dissolved, we just simply add its concentration (equal to the sulfate ions yielded by itself) to the outgoing sulfate concentration from the calcium sulfate:
![[SO_4^{-2}]^{total}=5x10^{-3}M+5.13x10^{-3}M\\[SO_4^{-2}]^{total}=0.010 M](https://tex.z-dn.net/?f=%5BSO_4%5E%7B-2%7D%5D%5E%7Btotal%7D%3D5x10%5E%7B-3%7DM%2B5.13x10%5E%7B-3%7DM%5C%5C%5BSO_4%5E%7B-2%7D%5D%5E%7Btotal%7D%3D0.010%20M)
Bibliography:https://books.google.com.co/books?id=LQwyfFc3pXsC&lpg=PA243&ots=zIJN3nSFWE&dq=pKs%20chemistry&pg=PA244#v=onepage&q=pKs%20chemistry&f=false page 243
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Answer:
In this case, a neutral atom with 12 protons will have 12 electrons. On the periodic table, the atom with 12 protons is magnesium, which is in group 2 . Therefore, it will most likely lose 2 electrons to have 10 electrons, and form a noble gas configuration. So, magnesium becomes Mg2+ .
Answer:
Number 6
Explanation:
A reflex action is an involuntary action and nearly instantaneous movement in response to a stimulus.
Acceleration is defined as velocity per unit time.


Here, a=acceleartion,
v=velocity=36 m/s
t=time=12 s



A car at rest ends accelerates for 12 seconds. After this time the car is going 36 m/s. So acceleration that is a=3 ms⁻².