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Answer:_____

Пояснювальна записка | Determine correspondence of titration methods and their standard substances. | Answer: Formulas of dissolved salts in fresh water:________________________ | Answer:________________________ | Determine correspondence of titration methods and their secondary standards (working solutions). |


Читайте также:
  1. Answer: Formulas of dissolved salts in fresh water:________________________
  2. Answer:________________________

 

Write the formula of relationship between normality (N) and molarity (M) of solution.

 

Answer:_________________

 

21. Determine the correspondence between titration system and the best indicator:

  Titration system   Indicator Answer:   A-____________;   B-____________;   C-____________.
A.     B.     C.     0,1 N hydrochloric acid HCl by 0,1 N Sodium hydroxide NaOH (pHeq=7,00) 0,1 N acetic acid CH3COOH by 0,1 N Sodium hydroxide NaOH (pHeq=8,87) 0,1 N hydrochloric acid HCl by 0,1 N Ammonium hydroxide NH4OH (pHeq=5,73)   Alizarin yellow R (pT=11,3) Thymol Blue (pT=1,7) Phenol red (pT=5,8) Bromophenol blue (pT=4,1) Litmus neutral (pT= 7,1) Thymol blue (pT=8,9) Cresol red (pT=8,2) Phenolphthalein (pT=9,6)  

 

22. Calculate pH of 0,01 N NaH2PO4 (pK1=1,96; pK2=6,70; pK3=12,44).

  1,96   Answer: _________________
  5,31
  12,92
  7,92

 

23. It is necessary for preparation of coarse-crystalline sediment:

  To precipitate of hot concentrated solutions; Answer:_____________
  To precipitate of cold diluted solutions;
  To precipitate of hot diluted solutions;
  To precipitate of cold concentrated solutions.

 

24. Calculate pH of buffer solution, contained 0,1 mol NH3 and 0,01 mol NH4Cl in 1 L (pK (NH3)=9,24).

  Solution: _________________________________________________________________________   _________________________________________________________________________________   Answer:_________________

 

25. Calculate Redox potential of solution, contained 0,01 N КMnO4 and 0,001 N MnSO4 per 1 L at рН=3 (Eo = + 1,51 V).

 

Solution: _________________________________________________________________________   _________________________________________________________________________________   Answer:_________________

 

26. Calculate dissociation degree α of 0,1 N H3BO3 (K 1 dis=5,8×10-10)

 

Solution:___________________________________________________

 

 

Answer:__ α =______

 

27. Equivalent mass of Ce3+ (A=140,12 g/mol) cation in reaction with Trilon B is:

  140,12 g-eq/g; Answer:_____________
  70,06 g-eq/g;
  46,71 g-eq/g;
  16,75 g-eq/g;
  53,96 g-eq/g.

 

28. Note functional groups in the formula of Trilon B

 

_________- CH2   CH2 - COONa
    N-CH2-CH2-N    
NaCOO- CH2   CH2 - _________

 

29. Calculate concentration of solution, contained 0,008 g of solute in 1000 g of solution.

  8 ppm; Answer:_____________
  800 ppm;
  0,8 ppm;
  80 ppm;
  0,008 ppm.

 


Write formulas of temporary hardness salts – cause of scale formation

Cause of scale?

Answer: Formulas of dissolved salts in fresh water:________________________


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