I definitly believe the answer is c. 2
The rows in the top third - This group consists of elements like Sodium, Magnesium, Potassium and Calcium on the right and Chlorine, Carbon, Nitrogen and Oxygen on the left.
Sodium and Chlorine are components of salt, a very important compound of our blood, essential for transferring electrical signals from the brain to the rest of the body and vice versa. Calcium is the building block of our bones, while Magnesium and potassium ensure proper functioning of our organs.
Answer:
![M_{base}=0.709M](https://tex.z-dn.net/?f=M_%7Bbase%7D%3D0.709M)
Explanation:
Hello,
In this case, since the reaction between potassium hydroxide and nitric acid is:
![KOH+HNO_3\rightarrow KNO_3+H_2O](https://tex.z-dn.net/?f=KOH%2BHNO_3%5Crightarrow%20KNO_3%2BH_2O)
We can see a 1:1 mole ratio between the acid and base, therefore, for the titration analysis, we find the following equality at the equivalence point:
![n_{acid}=n_{base}](https://tex.z-dn.net/?f=n_%7Bacid%7D%3Dn_%7Bbase%7D)
That in terms of molarities and volumes is:
![M_{acid}V_{acid}=M_{base}V_{base}](https://tex.z-dn.net/?f=M_%7Bacid%7DV_%7Bacid%7D%3DM_%7Bbase%7DV_%7Bbase%7D)
Thus, solving the molarity of the base (KOH), we obtain:
![M_{base}=\frac{M_{acid}V_{acid}}{V_{base}} =\frac{0.498M*42.7mL}{30.0mL}\\ \\M_{base}=0.709M](https://tex.z-dn.net/?f=M_%7Bbase%7D%3D%5Cfrac%7BM_%7Bacid%7DV_%7Bacid%7D%7D%7BV_%7Bbase%7D%7D%20%3D%5Cfrac%7B0.498M%2A42.7mL%7D%7B30.0mL%7D%5C%5C%20%5C%5CM_%7Bbase%7D%3D0.709M)
Regards.
Number 1 is C number 2 is B and number 3 is also B