Answer:
D. A change of appearance
C because an ion either lost or gained an electron. Lithium is an alkali metal and a lithium ion usually has a +1 charge
The answer is B. Filtration. it only lets the water through, while the sand will stay on top.
[H+] [OH-]= Kw
[H+] [OH-]=5.47x10^-14
Log [H+]+ Log [OH-]= -14 log 5.47
PH+POH= -13.26
we need more info to solve this