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H2SO4 is required to neutralize a certain amount of NaoH 1 Mol, if hydrochloric acid is used instead, the amount of Hcl in hydrochloric acid shall be used
2 Mol
Why does the neutralization reaction of sodium hydroxide and dilute hydrochloric acid use phenolphthalein solution to prove that the reaction is just complete, and why not purple litmus? Why does the neutralization reaction of sodium hydroxide and dilute hydrochloric acid use phenolphthalein solution to prove that the reaction is just complete? Why not purple litmus?
This is an old problem because when litmus fades, sodium hydroxide is already excessive. In this experiment, a drop of solution can change the ph value of the solution to a large extent, and phenolphthalein can greatly reduce the difference of reaction compared with litmus. Actually, chemistry is not very accurate. Which is better? Which is more similar to life? I liked chemistry most in high school. Come on, I hope you can get the title on the list.
This is an old problem because when litmus fades, sodium hydroxide is already excessive. In this experiment, a drop of solution can change the ph value of the solution to a large extent, and phenolphthalein can reduce the difference of reaction more than litmus. Actually, chemistry is not very accurate. Which one is better? Which one is more similar to life?
This is an old problem because when litmus fades, sodium hydroxide is already excessive. In this experiment, a drop of solution can change the ph value of the solution to a large extent, and phenolphthalein can reduce the difference of reaction more than litmus. In fact, chemistry is not very accurate. Which is better? Which is more similar to life? I liked chemistry most in high school. Come on. Come on, I hope you're top of the list.
RELATED INFORMATIONS
- 1. If mg a% caustic soda solution and ng a% dilute sulfuric acid solution are mixed and the litmus test solution is still purple, the numerical relationship between m and n is correct () A.m=n B.m > n C.m < n D. Inability to judge
- 2. Why does the indicator use phenolphthalein solution instead of litmus solution in the experiment of neutralization reaction of sodium hydroxide solution and dilute hydrochloric acid? Why does the indicator use phenolphthalein solution instead of litmus solution in the neutralization reaction of sodium hydroxide solution and dilute hydrochloric acid?
- 3. The following substances can not distinguish dilute hydrochloric acid from sodium hydroxide solution: A purple litmus B colorless phenolphthalein C sodium chloride solution D zinc particles
- 4. 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?
- 5. 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.
- 6. What about dilute hydrochloric acid and dilute sulfuric acid with purple litmus solution and colorless phenolphthalein solution, respectively Answer separately above
- 7. Phenolphthalein is added dropwise in sodium hydroxide solution. Add hydrochloric acid dropwise, the phenomenon is.
- 8. 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?
- 9. 1 Color change range of common indicators: methyl orange () phenolphthalein () litmus ()
- 10. 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
- 11. What can react with both HCl and NaOH?
- 12. Demonstrate chemical reaction between CO2 and NAOH Conclusion of experimental phenomenon 1. Pass CO2 into NAOH solution without obvious phenomenon. The CACO3 generated in the second step of the reaction is 2. Take the solution obtained from the above experiment and prove that the chemical reaction occurs when white precipitation occurs. In the test tube, drop the calcium chloride solution 3. Drop HCL into the white precipitate. What is the deficiency of this experiment? Conclusion of experimental phenomenon 1. Pass CO2 to CACO3 in the second step of reaction formation without obvious phenomenon in NAOH solution, 2. Take the solution obtained from the above experiment to form white precipitate, indicating that there is carbonate new product in reaction 1. In a test tube, the formation of a calcium chloride solution drops in, proving that chemistry occurs 3. Drop HCL white precipitate into white precipitate to dissolve and react There are bubbles.
- 13. During the following chemical changes: XHCl YNaOH The substance represented by Z, X may be () A. Cu B. AgNO3 C. Ba (OH)2 D. CuO
- 14. It is proved that the chemical reaction between CO2 and NaOH must have occurred. Why can it be proved by adding HCl?
- 15. Al reacts with NaOH, NaAlO2 reacts with HCl, and Al reacts with NaO. Write their chemical reaction equations
- 16. Color after adding phenolphthalein and litmus test solution to acid and alkali salt Must have color Color after adding phenolphthalein and litmus test solution to acid and alkali salt Must have color.
- 17. What color do litmus and phenolphthalein come from when they encounter acid - base solutions.
- 18. Must alkali make purple litmus test solution turn blue, colorless phenolphthalein test solution turn red Alkali can make purple litmus test solution blue, colorless phenolphthalein test solution red
- 19. The egg white drops into the purple litmus in blue and the colorless phenolphthalein solution in red. The PH of the egg white may be ( 1-3 Is A 4-6 is B 7 is C 8-11 is D
- 20. Colorless phenolphthalein, purple litmus acid and alkali neutral what color? Is there anything else that can test for acid-base properties? Colorless phenolphthalein, purple litmus acid and alkali neutral what color? Is there anything else that can test for acid and alkali?