They turn litmus paper blue.
Answer:
THERE IS NOTHING MENTION HERE HOW CAN ANYONE KNOW ABOUT IT?]
Explanation:
Answer:
18.
Explanation:
1) according to the reaction (M(Fe)=56; M(O₂)=32; V₀=22.4):
4Fe+3O₂⇒2Fe₂O₃; - ν(O₂)=0.75*ν(Fe);
2) ν(Fe)=m(Fe)/M(Fe)=60/56≈1.071 [mol];
3) ν(O₂)=0.75*1.071=0.804 [mol];
4) V(O₂)=V₀*ν(O₂); ⇒ V(O₂)=22.4*0.804=18 [lit].
Milk (lowest acidity) < Coffee < Orange juice < Soda pops < vomit < Battery acid (highest acidity)
explanation :
pH values of all :
battery acid pH = 1.0
vomit pH = 2.0
soda pop pH = 2.5
orange juice pH = 3.5
coffee pH = 5.0
milik pH = 6.5
pH value is lesser acidity is more . high pH indicate lesser acidic nature
Answer:
pH=4.63
Explanation:
The firt step is identify the <u>Acid</u> and the <u>conjugated base</u>:
HA <=>
+ ![H^+](https://tex.z-dn.net/?f=H%5E%2B)
So, for this case we will have:
<=>
+ ![H^+](https://tex.z-dn.net/?f=H%5E%2B)
Then:
HA = ![C_6H_5COOH](https://tex.z-dn.net/?f=C_6H_5COOH)
=![C_6H_5COO^-](https://tex.z-dn.net/?f=C_6H_5COO%5E-)
With this in mind we can use the <u>henderson-hasselbach equation</u>:
pH = pKa + Log ![\frac{A^-}{HA}](https://tex.z-dn.net/?f=%5Cfrac%7BA%5E-%7D%7BHA%7D)
We can calculate the <u><em>pKa</em></u> first
![pKa~=~-~Log~(6.30x10^-^5)~=~4.2](https://tex.z-dn.net/?f=pKa~%3D~-~Log~%286.30x10%5E-%5E5%29~%3D~4.2)
Then we can put the values in the equation:
pH = 4.2 + Log(
)
pH= 4.63