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            "q": "What is the difference between bacteriostatic water and sterile water for injection?",
            "a": "Sterile water is purified water with nothing added and is single-use only. Bacteriostatic water is sterile water with ~0.9% benzyl alcohol preservative, allowing the same vial to be accessed multiple times."
        },
        {
            "q": "How long can a multi-dose vial of bacteriostatic water be used after opening?",
            "a": "A common laboratory practice is to discard a multi-dose bacteriostatic water vial 28 days after first opening and to store it at controlled room temperature (68–77°F / 20–25°C). Always follow the specific product label."
        },
        {
            "q": "Why does bacteriostatic water contain benzyl alcohol?",
            "a": "Benzyl alcohol is a preservative that slows or stops bacterial growth inside the vial after it is opened, making repeated access to the same vial practical in laboratory settings."
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            "q": "What is the difference between bacteriostatic water and sodium chloride?",
            "a": "Bacteriostatic water is purified water with a benzyl alcohol preservative and no salt. Sodium chloride 0.9 percent is an isotonic salt solution, sold both without a preservative (single use) and in a bacteriostatic form with benzyl alcohol added. The salt is the difference: it affects ionic strength, which can change how a lyophilised material dissolves and behaves in solution. Where a method or supplier names a diluent, follow that."
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