Question
Connie wa s m aking sodium chloride by adding an acid to an alkali. She followec the progre ss of th e reaction with a pH sensor.What else could she have used to detect when the rea ction was te?
Answer
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Isidore
Professional · Tutor for 6 years
Answer
Connie could have used several other approaches to detect the end of the reaction:1. Conductivity sensor: A conductivity sensor could have been used to measure the conductance of the solution. Once sodium chloride has completely formed, the conductivity of the solution typically decreases. That's why it might be a suitable detector of the reaction's completion.2. Recorded observation: Apart from utilizing any technology, Connie could have also simply observed the reaction. If there was no longer any visible reaction occurring (e.g. bubbling or fizzy sound), this could indicate that the reaction has finished.3. Titration: The titration method could be prepared by using an acid or base of known concentration. This substance (titrant) with known concentration would be slowly added to the solution until the reaction is neutral. At this point, all of the Sodium Chloride is likely formed so it's a good indicator.4. Use Indicator: Using a chemical indicator such as phenolphthalein that changes colour to show when all the acid or alkali is reacted. When enough sodium chloride is formed to neutralize the solution, an indicator would usually change color, signalling the end of your reaction. 【Explanation】: Sodium Chloride is a type of salt formed from the neutralization of an acid and a base, on reaching a pH of 7. A rough neutralization reaction is indicated by such fallback parameters explained above in the absence of a pH sensor. The discussed methods rely on different principles from a conductivity sensor's reliance on a decrease in the conductance once Sodium chloride is totally formed, to an indicator's explicit visual sign through change of color. But, you must assure you know exactly how to apply them correctly to avoid misreadings.