A student is asked to make label for a solution of 1M sodium hydroxide. Analyze the chemical label they prepared (shown below) for its completeness:

1M NaOH

Sodium Hydroxide in DI water

Caution: Corrosive

Prepared by: Jessie Doe

Question

A student is asked to make label for a solution of 1M sodium hydroxide.  Analyze the chemical label they prepared (shown below) for its completeness:

1M NaOH

Sodium Hydroxide in DI water

Caution: Corrosive

Prepared by: Jessie Doe

BlackTom AI · Accepted Answer

The task presents a student-labeled solution and asks us to evaluate its completeness. Since there are no answer options provided, we cannot perform an option-by-option selection in the traditional sense. Instead, I will examine the label itself and discuss what is typically required for a complete label on a chemical solution, and what information is missing or could be improved.

First, let’s list the information that appears on the label as given: the identity and concentration of the solution (1M NaOH), the chemical name and medium (Sodium Hydroxide in DI water), a hazard statement or precaution (Caution: Corrosive), and the preparer’s name (Prepared by: Jessie Doe).

Next, consider standards for chemical labeling. A complete solution label often should include: the chemical identity (name and formula), the concentration and units (which are provided as 1M NaOH), the physical state or solution medium (in DI water, which is stated), the hazard classification or precautionary statement (Corrosive is present, which is appropriate but could be enhanced with more specific hazard statements), the date prepared or date of opening, the volume or amount, the storage conditions, and the preparer’s identity. It may also include an expiration date or shelf life if applicable, and any applicable regulatory or safety pictograms depending on the labeling system in use.

The label currently provides several core items: identity, concentration, solution medium, a basic hazard cue, and the preparer. However, it lacks some key data that would improve completeness and traceability:
- Date prepared: There is no date, which is important for tracking the age of the solution and its suitability for use.
- Volume or amount: The label doesn’t specify how much solution is present, which is often necessary for handling and inventory purposes.
- Storage conditions: There is no guidance on how to store the solution (e.g., cool, away from heat, in a corrosives cabinet, etc.).
- Expiration or shelf-life information: For some solutions, especially caustics like NaOH, shelf-life guidance can be informative.
- Specific hazard statements or pictograms: If following a standard (e.g., GHS), more explicit hazard and precautionary statements and relevant symbols could be included.
- Batch or lot number: Helpful for traceability in case of an incident or quality concern.

Why the missing date matters: without the date prepared, a user cannot assess whether the solution is still appropriate for use, given factors like concentration drift, contamination risk, or degradation over time. This is a common completeness criterion for chemical labels.

Why some items are not strictly necessary for every context but are still beneficial: volume, storage, and batch information aren’t always required in very small, single-use settings, but in a lab context where solutions are shared or stored, having these details reduces ambiguity and risk.

In summary, the labeled information covers the essential identity and concentration, but the absence of a date prepared (and optionally volume, storage, batch, and more explicit hazard details) means the label is not fully complete by typical laboratory labeling standards. If you were to improve the label, you would add at least the date prepared, volume, and storage instructions, and consider including more specific hazard statements or pictograms depending on the labeling system you’re following.

CHEM143B_SP25_LST CHEM 143B: LAB SAFETY EXAM - Spring 2025

A student is asked to make label for a solution of 1M sodium hydroxide. Analyze the chemical label they prepared (shown below) for its completeness: 1M NaOH Sodium Hydroxide in DI water Caution: Corrosive Prepared by: Jessie Doe

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