C(HClO) = 0,3 M.
<span>V(HClO) = 200 mL = 0,2 L.
n(HClO) = </span>c(HClO) · V(HClO).
n(HClO) = 0,06 mol.<span>
c(KClO</span>) =
0,2 M.
<span>V(KClO) = 0,3 L.
n(KClO) = 0,06 mol.
V(buffer solution) = 0,2 L + 0,3 L = 0,5 L.
ck</span>(HClO) = 0,06 mol ÷ 0,5 L = 0,12 M.
cs(KClO) = 0,06 mol ÷ 0,5 L = 0,12 M.<span>
Ka(HClO</span>) =
2,9·10⁻⁸.<span>
This is buffer solution, so use Henderson–Hasselbalch
equation:
pH = pKa + log(cs</span> ÷ ck).<span>
pH = -log(</span>2,9·10⁻⁸) + log(0,12 M ÷ 0,12 M).<span>
pH = 7,54 + 0.
pH = 7,54</span>
Answer:
the gradual movement of particles from a place of high concentration to low concentration
Deuterium also called heavy hydrogen, isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen (one proton).
The deuterium atom is widely used in prototype fusion reactors.
Step ![1](https://tex.z-dn.net/?f=1)
<u>find the mass of a single washer</u>
Divide the total mass by the number of washers
![\frac{0.4168}{1000} =0.0004168\ Kg](https://tex.z-dn.net/?f=%5Cfrac%7B0.4168%7D%7B1000%7D%20%3D0.0004168%5C%20Kg)
![0.0004168kg=4.168*10^{-4} kg](https://tex.z-dn.net/?f=0.0004168kg%3D4.168%2A10%5E%7B-4%7D%20kg)
Step ![2](https://tex.z-dn.net/?f=2)
<u>Convert kg to mg</u>
we know that
![1 kg=1*10^{6} mg](https://tex.z-dn.net/?f=1%20kg%3D1%2A10%5E%7B6%7D%20mg)
so
![4.168*10^{-4}*10^{6} =4.168*10^{2}mg=416.8 mg](https://tex.z-dn.net/?f=4.168%2A10%5E%7B-4%7D%2A10%5E%7B6%7D%20%3D4.168%2A10%5E%7B2%7Dmg%3D416.8%20mg)
therefore
<u>the answer is</u>
![416.8 mg](https://tex.z-dn.net/?f=416.8%20mg)
Ca, Sr, Ba have similar chemical properties.
Explanation: They are in the same group (Alkaline Earth Metals)