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Sia

юля's Question
Chemistry
Posted about 1 month ago
Для визначення фторид-іонів приготували серію стандартний розчинів і виміряли 
потенціали фторид-селективного електроду відносно аргентумхлоридного електроду 
порівняння. Використовуючи отримані дані побудувати графік
СF- , моль/л 1∙10-5
 1∙10-4
 1∙10-3
 1∙10-2
 1∙10-1
Е, мВ 330 275 225 170 120
За градуювальник графіком визначити концентрацію фторид-іонів (г/л) в 
досліджуваному зразку, якщо 15 мл досліджуваного розчину помістили в колбі 
ємністю 100,0 мл і довели об’єм до мітки фоновим розчином. Потенціал фторид￾селективного електроду в отриманому розчині складає 195 мВ
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Answer from Sia
Posted about 1 month ago
Solution
1
Plot the data: You have measured the potentials (E, mV) for different concentrations of fluoride ions (CF, mol/L). The data points are: (1∙10^-5, 330), (1∙10^-4, 275), (1∙10^-3, 225), (1∙10^-2, 170), (1∙10^-1, 120). You can plot these points on a graph with CF on the x-axis and E on the y-axis
2
Determine the slope and intercept: Using linear regression or a graphing tool, find the equation of the line that best fits your data. This will typically be in the form of E=mlog(CF)+bE = m \cdot \log(CF) + b, where mm is the slope and bb is the y-intercept
3
Calculate the concentration: With the potential of the unknown solution (195 mV), substitute this value into the equation obtained from the graph to solve for CF. Rearranging gives CF=10EbmCF = 10^{\frac{E - b}{m}}
4
Convert to g/L: Once you have CF in mol/L, convert it to g/L using the molar mass of fluoride ions (approximately 19 g/mol). The conversion is done by multiplying the concentration in mol/L by the molar mass: Cg/L=CF19C_{g/L} = CF \cdot 19
Answer
[Insert final answer here]
Key Concept
The relationship between the potential of a selective electrode and the concentration of ions can be described by the Nernst equation.
Explanation
The concentration of fluoride ions in the unknown solution can be determined by using the potential measured and the calibration curve obtained from standard solutions.

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