A student is asked to make label for a Sodium Nitrite (NaN02) solution. Analyze the chemical label they prepared (shown below) for its completeness:

3M NaN02

Sodium Nitrite (in DI water)

Handle with care!

Date: 01/01/2021 Prepared by: Jordan Lee

Question

A student is asked to make label for a Sodium Nitrite (NaN02) solution.  Analyze the chemical label they prepared (shown below) for its completeness:

3M NaN02

Sodium Nitrite (in DI water)

Handle with care!

Date: 01/01/2021 Prepared by: Jordan Lee

BlackTom AI · Accepted Answer

The scenario asks us to assess whether the lab label for a Sodium Nitrite solution is complete.

Option: 'The label is not complete, hazards are not listed.'

First, consider the key components of a complete chemical label in many laboratory and safety contexts. A thorough label typically includes the chemical name and formula, concentration or amount, physical state, solvent (if applicable), hazard information or warning statements, applicable precautionary statements, storage conditions, date prepared, and preparer’s initials or name. It may also include an identifier like a lot or batch number and expiry date where relevant.

Examining the provided label:
- '3M NaN02' appears to intend '3 M NaNO2' (Sodium Nitrite). There is a typographical error in the chemical formula as written, which can lead to confusion about the substance.
- 'Sodium Nitrite (in DI water)' indicates the solvent is deionized water, which is good specificity for the solution composition.
- 'Handle with care!' is a general safety phrase but does not convey specific hazards or risks, which limits usefulness for risk assessment and emergency response.
- 'Date: 01/01/2021 Prepared by: Jordan Lee' provides date and preparer information, which is appropriate for traceability.
- There is no explicit hazard statement (e.g., toxicity concerns, oxidizing properties, methemoglobinemia risk associated with nitrites), no signal word (DANGER/WARNING), no pictograms, and no storage or handling conditions beyond a vague admonition. These omissions mean the label fails to communicate critical safety information to the user.

Why this option is correct (the label is not complete):
- Hazards are not listed. Without hazard statements and signal words, a user cannot quickly assess the risks or necessary precautions, which is a core requirement for chemical labeling in many settings.
- The potential consequences of mislabeling (e.g., the typo NaN02) can lead to misidentification and improper handling or documentation. Clarity in naming and formula is essential to avoid such misinterpretation.
- Absence of storage conditions, shelf-life or expiration, and any first-aid or spill-response guidance leaves critical operational and emergency information missing.

Why the other (nonexistent) options would be incorrect to consider here: since the provided data shows only one option, there are no additional choices to evaluate. However, if prompted to critique the single option itself, you would assess that while some elements (concentration, solvent, date, and preparer) exist, the lack of explicit hazard information and incomplete chemical naming are substantial deficiencies that render the label incomplete.

In summary, the main reason this label is considered incomplete is that it omits hazard information and specific safety details that are essential for safe handling and emergency response, even though it includes some correct elements like concentration, solvent, date, and preparer.

CHEM100A_SP25_LST CHEM 100A: LAB SAFETY EXAM - Spring 2025

A student is asked to make label for a Sodium Nitrite (NaN02) solution. Analyze the chemical label they prepared (shown below) for its completeness: 3M NaN02 Sodium Nitrite (in DI water) Handle with care! Date: 01/01/2021 Prepared by: Jordan Lee

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