Answer analysis, thank you! Thank you for the detailed answer!

Analysis: HCO3- and OH- reactions cannot coexist;

The solution that makes the pH test paper dark blue is alkaline, and if the ions do not react with each other, they can coexist;

A solution of water-ionized c(h+)=10-12mol L-1 may be acidic or alkaline;

The solution that can release H2 by adding mg is acidic;

The solution that turns the methyl orange red is acidic;

The solution with pH = 0 is acidic, and under acidic conditions, NO3- has strong oxidizing properties

Solution: HCO3- and OH- reactions cannot coexist, so they are wrong;

The solution that makes the pH test paper dark blue is alkaline, and the ions do not react with each other under alkaline conditions, so it can coexist, so it is correct;

The solution of water ionized C(H+)=10-12mol L-1 may be acidic or alkaline, but whether it is acidic or alkaline, Clo- has strong oxidation and redox reaction with SO32-, so it is wrong;

The solution that can release H2 by adding mg is acidic, and the ions do not react with each other under acidic conditions, so they can coexist, so it is correct;

The solution that makes methyl orange turn red is acidic, and the ions do not react with each other, so it can coexist, so it is correct;

The solution of pH=0 is acidic, and under acidic conditions, NO3- has strong oxidation and redox reaction with Fe2+, so it is wrong so choose B

: HCO- and OH- two ion reactions;

Add OH- to the solution;

There may be OH- or H+ in solution;

Add H+ to the solution;

According to the range of discoloration of methyl orange, it can be judged that there is h+ in the solution:p h=0, the solution is acidic, and there is h+ in the solution

In summary, the answer: b is only true.

It should belong to the same kind and cannot coexist, under acidic conditions, ferrous ions and nitrate ions react to oxidize divalent iron ions to trivalent. Thank you

There is a formula for this ridge defeat, which denotes f1pf2 as , and the width of the short axis length is half as b

Then S f1pf2=b Sakura trembling tan(2)=4tan(15°). Hope.

6 oz + 10 oz = 1 lb.

1 pound = 16 ounces.

First, calculate the Na2SO4 Mopel Mass Balance.

2.Then calculate the actual quality required.

Please thank you in time.

1. An edge and height can make countless triangles, because the intersection of height and edge can be on the side, and become the fixed shirt branch grip point and the extension line of the edge.

2. You can make an isosceles three-tie front angle, because the isosceles triangle three-line combination or Qingyi, so the ...... can be determined

The answer is a

Because general alcohols can react with Na, the difference between phenol and alcohol cannot be explained in A, answer B is because phenol is acidic, so it can undergo acid-base reaction in NaOH, and answer C is because the hydroxyl group has an effect on the benzene ring, which makes the benzene ring prone to substitution reaction, D and C are the same principle.