Multiple Choice QuestionNormal, unpolluted rain has a pH of about Blank______.Multiple choice question.45.678.1

Break Down the Problem

1. Identify the pH of normal, unpolluted rain.
2. Analyze the given options for the correct answer.

Relevant Concepts

• The pH scale is used to measure acidity and basicity.
• Pure water has a neutral pH of 7.
• Rainwater can be slightly acidic due to dissolved carbon dioxide.

Analysis and Detail

• Normal, unpolluted rain typically has a pH around 5.6, which is slightly acidic due to natural components such as carbonic acid formed when carbon dioxide mixes with water.
• The given options are 4.5, 6.7, and 8.1.

Verify and Summarize

• Among the choices, the closest to the natural pH of unpolluted rain is 6.7.
• Although it is not quite a typical value (which is closer to 5.6), it suggests a less acidic solution than option 4.5 and is not basic like 8.1.

Final Answer

The correct answer is 6.7.