Question

1.Explain why a valid comparison of data is possible only if all solutions are prepared in the 1.0% nitric acid solution.?

2.The temperature of the plasma is very hot. Explain why the quartz tube does not melt while the torch is in use.?
3.Explain why the formation of refractory (thermally stable) oxides is not a serious problem in the argon plasma.?

Answer 1

A valid comparison of data is possible if solutions are prepared in the 1.0% nitric acid solution. The quartz tube withstands the intense heat of the plasma due to its high melting point and excellent thermal stability and refractory oxides' formation is not a significant concern in argon plasma due to the inert nature of argon

Step-by-step explanation:

The questions can be answered as -

1. A valid comparison of data requires a consistent environment. Using a 1.0% nitric acid solution ensures uniformity in the chemical matrix, minimizing variables. This consistency allows accurate comparisons of experimental results without interference from different solution compositions affecting the outcome.
2. The quartz tube withstands the intense heat of the plasma due to its high melting point and excellent thermal stability. Quartz, primarily composed of silicon dioxide, has a melting point significantly higher than the operating temperature of the plasma torch. This property prevents the quartz tube from melting or deforming during use.
3. Refractory oxides' formation is not a significant concern in argon plasma due to the inert nature of argon. Argon lacks the reactivity to form thermally stable oxides, preventing the unwanted buildup of refractory compounds. The use of argon as the plasma gas ensures a stable and non-reactive environment, minimizing the risk of oxide formation during the analytical process.