What does the red litmus turn blue and the blue litmus turn red, respectively

The litmus test paper for acid solutions is blue and acid solutions turn red.
Similarly, litmus test paper for alkaline solution is red and alkaline solution can turn it blue.

Why doesn't hydrogen ion nitrate ion and ferrous ion coexist in solution?

Nitrate ions have strong oxidability under acidic conditions, and ferrous ions can be oxidized to iron ions, so they can not coexist

RELATED INFORMATIONS

1. Can the reaction of copper with concentrated sulfuric acid be written as an ion equation
2. Ion Equation for the Reaction of Concentrated Sulfuric Acid with Copper
3. A sufficient amount of copper was reacted with 50ml 18mol / L sulfuric acid under heating conditions, and after the reaction was stopped, the amount of reduced H2SO4 was A.0.45mol B.0.45~0.9mol C.0.9mol D.<0.45mol
4. To 50 ml of 18 mol/L concentrated sulphuric acid, add sufficient copper flakes to heat to produce a volume of SO2 gas under standard conditions,=20.16, or =10... To 50 ml of 18 mol/L concentrated sulfuric acid, add a sufficient amount of copper sheet to heat to produce a volume of SO2 gas in the standard case,=20.16,=10.08, or >10.08 and To 50 ml of 18 mol/L concentrated sulphuric acid, add sufficient copper flakes to heat to produce a volume of SO2 gas under standard conditions,=20.16, or =10... To 50 ml of 18 mol/L concentrated sulfuric acid, add a sufficient amount of copper sheet to heat to produce a volume of SO2 gas in the standard case,=20.16,=10.08, or >10.08, and To 50 ml of 18 mol/L concentrated sulphuric acid, add sufficient copper flakes to heat to produce a volume of SO2 gas under standard conditions,=20.16, or =10... To 50 ml of 18 mol/L concentrated sulphuric acid, add a sufficient amount of copper sheet to heat to produce a standard volume of SO2 gas,=20.16,=10.08, or >10.08 and
5. Put a copper sheet in a test tube, inject a certain volume of concentrated sulfuric acid, and observe the color of CuSO4 solution generated, and how to do it
6. Nitrate is the addition of concentrated sulphuric acid and copper flakes Add concentrated sulphuric acid and copper to the nitrate
7. An excess copper sheet is added to 1.8 mol of concentrated sulfuric acid, heated and reacted sufficiently to produce a gas volume that may be
8. In the method of testing nitrate, if it is nitrate, you need to add concentrated sulfuric acid and copper, how to write the equation
9. What happens when copper is placed in the following acids? Write the relevant chemical reaction equation 1 dilute hydrochloric acid 2 concentrated sulfuric acid 3 dilute sulfuric acid 4 concentrated nitric acid 5 dilute nitric acid Explain why you can't react!
10. What happens when concentrated sulfuric acid reacts with water? You were watching TV and said it would explode? What happens when concentrated sulfuric acid reacts with water? Did you just watch TV?
11. Is ammonia tested with wet purple litmus paper or wet red litmus paper? Can you use wet PH test paper?
12. What's the gas that makes the moist red litmus blue?
13. Does the reaction of copper with nitric acid require heating
14. Dilute nitric acid and copper shall be heated. Dilute nitric acid and copper shall be heated
15. Reaction of Copper with Concentrated Sulfuric Acid Copper is heated with concentrated sulfuric acid and 4.9g sulfuric acid is reduced in the reaction. (1) Volume of gas generated under standard condition (2) The solution after the reaction was prepared into a solution of 500 ml, and the amount and concentration of the substance in the solution were obtained Reaction of copper with concentrated sulfuric acid Copper is heated with concentrated sulfuric acid and 4.9g sulfuric acid is reduced in the reaction. (1) Volume of gas generated in standard condition (2) The solution after the reaction was prepared into a solution of 500 ml, and the amount and concentration of the substance in the solution were obtained Reaction of copper with concentrated sulfuric acid Copper is heated with concentrated sulfuric acid and 4.9g sulfuric acid is reduced in the reaction. (1) Volume of gas generated under standard condition (2) The solution after the reaction was prepared into a solution of 500 ml, and the amount and concentration of the substance in the solution were obtained
16. Color change of phenolphthalein with acid and alkali Color change of purple litmus test solution with acid and alkali
17. Determination of Color-Changing Range of Chemical Indicator Methyl Orange Phenol Phthalate Purple litmus Study on that color change range of methyl orange phenolphthalein purple litmus
18. 1 Color change range of common indicators: methyl orange () phenolphthalein () litmus ()
19. Among the following reagents, salt solution, sodium hydroxide solution and dilute sulfuric acid can be identified as () A dilute hydrochloric acid B colorless phenolphthalein C litmus test solution D limestone Why?
20. Phenolphthalein is added dropwise in sodium hydroxide solution. Add hydrochloric acid dropwise, the phenomenon is.