Answer:
Explanation:
OK this is simple
i'll try to do the unanswered question
CaCl2
In the table
You look for calcium,Ca you fill 1
THen for Chloride=2
i hope you've understood
Answer:
Petersburg, Russia), Russian chemist who developed the periodic classification of the elements. Mendeleev found that, when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern, or periodicity, of properties within groups of elements.
Explanation:
Hope this helps!!!
pH at the equivalence point is 3.60
<h3>
Define pH.</h3>
pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 
gram-equivalents per liter, into numbers between 0 and 14. The hydrogen ion concentration in pure water, which has a pH of 7, is 
gram-equivalents per liter, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
given that,
HNO2 = 0.100M
KOH= 0.200M
pKa = 3.34
using formula,
pH = pKa + log (salt /acid)
= 3.34 + log (0.200/0.100)
= 3.34 + log 2
= 3.34 + 0.30
= 3.60
pH at the equivalence point is 3.60
Learn more about hydrogen ion concentration here:-
brainly.com/question/21931436
#SPJ4
Okay so the answer to this one is very simple 91
