A student is asked to make label for a solution of 1.0N silver nitrate. Analyze the chemical label they prepared (shown below) for its completeness:

1.0M AgN03 (in DI water)

Caution: Corrosive & environmentally damaging

Date: 04/01/2021 Prepared by: Ara Smith

Question

A student is asked to make label for a solution of 1.0N silver nitrate.  Analyze the chemical label they prepared (shown below) for its completeness:

1.0M AgN03 (in DI water)

Caution: Corrosive & environmentally damaging

Date: 04/01/2021 Prepared by: Ara Smith

BlackTom AI · Accepted Answer

Question restatement: A student is asked to make a label for a solution of 1.0N silver nitrate. Analyze the label provided: 1.0M AgN03 (in DI water). Caution: Corrosive & environmentally damaging. Date: 04/01/2021 Prepared by: Ara Smith.

Option 1: The label is complete, nothing is missing.
- This is incorrect. While some information is present, there are gaps. Specifically, a CAS number is not listed, and there is an inconsistency between the stated chemical form (1.0N vs 1.0M) and the species named (silver nitrate). Labels should be precise and include identifiers beyond just a chemical formula, as discussed below.

Option 2: The label is not complete, hazards are not listed.
- This is not the best choice. The label does include hazard information: it says Caution: Corrosive & environmentally damaging. While the hazards are not exhaustive (pictograms, signal word, or hazard statements from a standard system might be expected in some contexts), the option overstresses absence of hazards. The label does contain some hazard information, so this statement is misleading.

Option 3: The label is not complete, CAS # should be listed.
- This is correct. A complete chemical label typically includes a CAS (Chemical Abstracts Service) registry number to uniquely identify the substance. Silver nitrate has a CAS number (7772-99-8). The absence of CAS number means the label is incomplete for many regulatory and inventory purposes, even if some other information is present. This directly addresses a common labeling standard requirement.

Option 4: The label is not complete since the full chemical name is not included.
- This is not the strongest critique here. While the label does not literally spell out the long-form name in text (it uses the formula AgNO3), many labeling conventions accept the common chemical name (silver nitrate) or the chemical formula as identifiers. The more critical deficiency, from a compliance and clarity standpoint, is the missing CAS number. Therefore, asserting that the label is incomplete solely because the full name isn’t written is less accurate than identifying the CAS omission.

Summary of reasoning: The central flaw in the label is the missing CAS number, which is a standard identifier used across databases and documentation for chemical substances. While hazards are partially presented and there is some chemical form information, these do not compensate for the absence of a CAS number. The hazards note is present, so the claim about hazards being entirely missing is incorrect. The claim about the full chemical name lacking is not as decisive, since many labels rely on formulas or common names, and in this case the key missing element is the CAS number.

CHEM100A_SP25_LST CHEM 100A: LAB SAFETY EXAM - Spring 2025

A student is asked to make label for a solution of 1.0N silver nitrate. Analyze the chemical label they prepared (shown below) for its completeness: 1.0M AgN03 (in DI water) Caution: Corrosive & environmentally damaging Date: 04/01/2021 Prepared by: Ara Smith

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