Final answer:
Only solder that does not contain lead must be used on a portable drinking water system to prevent lead poisoning. The use of copper piping can be a safe alternative to replacing lead pipes to ensure water quality. Federal regulations usually require plumbing materials to be lead-free and safe for potable water.
So option (A) is correct.
Step-by-step explanation:
The solder used on portable drinking water systems must not contain lead. Lead is toxic and can cause serious health issues, such as lead poisoning, especially when it leaches into drinking water. Therefore, federal regulations typically require that plumbing materials for potable water not only be lead-free to prevent contamination but also conform to safety standards.
While copper, flux, and silver are also used in solder, they are generally acceptable for use in potable water systems, but the use of copper piping to replace lead pipes, as mentioned, can help reduce the risk of lead contamination in drinking water. These exercises also emphasize the significance of replacing lead pipes to maintain water safety.
Understanding the properties of materials is essential to ensuring water safety, as illustrated by the fact that distilled water does not conduct electricity; however, a water solution of an ionic compound does conduct electricity well. This is pertinent because lead's ability to leach into the water can increase when the water is more corrosive or conductive.