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Let's solve the two parts of the problem:

### (a) Converting 0.000221 moles per liter to scientific notation:
The number \(0.000221\) can be written as:
\[
0.000221 = 2.21 \times 10^{-4}
\]
So, in scientific notation, the hydrogen ion concentration is \(2.21 \times 10^{-4}\) moles per liter.

### (b) Converting \(6.4 \times 10^3\) pounds to standard notation:
The number \(6.4 \times 10^3\) can be written as:
\[
6.4 \times 10^3 = 6400
\]
So, the black rhinoceros can weigh up to 6400 pounds.

Would you like any further details or have questions on these conversions?

Here are 5 related questions to explore further:
1. What are the rules for converting numbers into scientific notation?
2. How do you multiply and divide numbers in scientific notation?
3. What are some real-world applications of using scientific notation?
4. How do you convert between different units (e.g., pounds to kilograms)?
5. How does scientific notation help in representing very small or very large numbers?

**Tip**: Always ensure you move the decimal point the correct number of places when converting between standard and scientific notation.

A certain solution has a hydrogen ion concentration of 0.000221 moles per liter. Write this number in scientific notation. A black rhinoceros can weigh up to 6.4 × 10³ pounds. Write this number in standard notation.

Learn how to convert a hydrogen ion concentration of 0.000221 moles per liter into scientific notation as 2.21 × 10^-4 moles per liter. Understand how to express a black rhinoceros's weight of 6.4 × 10³ pounds in standard notation as 6400 pounds. This problem covers scientific and standard notation and is ideal for students in Grades 7-9.

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