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Does the reaction of copper with nitric acid require heating
Reaction with dilute nitric acid requires heating, while reaction with concentrated nitric acid requires no heating
Does the blue litmus paper turn purple when exposed to water? E.g. Does the blue litmus strip turn purple when exposed to water? Such as a question
Soak that purple litmus teste paper in non-volatile acid to form a red litmus teste paper;
Dip purple litmus paper into sodium carbonate to make blue litmus paper.
Therefore the principle that uses is litmus to meet acid turn red, with alkali turn blue principle.
The red is used to test for alkaline substances and the blue is used to test for acidic substances
It's red, of course. It's like purple litmus...
Again: should be. Neutral is 7, and litmus does not change color range is pH 6 to 8,
Eight is purple, so neutral is purple, right?
As long as pH 8, purple litmus reagent (paper) will change color drops ~
If a neutralizing agent is dropped on a blue or red litmus paper, the paper should
Turn purple!
RELATED INFORMATIONS
- 1. What's the gas that makes the moist red litmus blue?
- 2. Is ammonia tested with wet purple litmus paper or wet red litmus paper? Can you use wet PH test paper?
- 3. What does the red litmus turn blue and the blue litmus turn red, respectively
- 4. Can the reaction of copper with concentrated sulfuric acid be written as an ion equation
- 5. Ion Equation for the Reaction of Concentrated Sulfuric Acid with Copper
- 6. 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
- 7. 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
- 8. 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
- 9. Nitrate is the addition of concentrated sulphuric acid and copper flakes Add concentrated sulphuric acid and copper to the nitrate
- 10. 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
- 11. Dilute nitric acid and copper shall be heated. Dilute nitric acid and copper shall be heated
- 12. 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
- 13. Color change of phenolphthalein with acid and alkali Color change of purple litmus test solution with acid and alkali
- 14. 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
- 15. 1 Color change range of common indicators: methyl orange () phenolphthalein () litmus ()
- 16. 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?
- 17. Phenolphthalein is added dropwise in sodium hydroxide solution. Add hydrochloric acid dropwise, the phenomenon is.
- 18. What about dilute hydrochloric acid and dilute sulfuric acid with purple litmus solution and colorless phenolphthalein solution, respectively Answer separately above
- 19. Application method and phenomenon of acid - base indicator, such as colorless phenolphthalein test solution, purple litmus test solution, etc. Application method and phenomenon of acid - base indicator. such as colorless phenolphthalein test solution, purple litmus test solution, etc.
- 20. Excuse me why litmus test solution can not be used as indicator in acid-base neutralization titration, but phenolphthalein can I know because its color range is too large, not accurate, but its color range is pH 5.0-8.0, and phenolphthalein is 8.10.0, in the alkali solution is more accurate than litmus ah, why can not be used?