Why bacteriostatic water has a pH range rather than a pH, and why it does not hold one

Published 26 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
The monograph specifies a pH range for bacteriostatic water that spans mildly acidic to neutral, not a single value, because pure water has no buffering capacity and its pH is moved by tiny amounts of dissolved acid or base. Carbon dioxide from the air dissolves to carbonic acid and pulls freshly exposed water below 7. When a lyophilised peptide is dissolved in this water, the solution takes its pH from the peptide and its counterion, not from the water.

Why a range

Buffering capacity is the ability to absorb added acid or base without a pH change. Water alone has almost none; a few parts per million of carbon dioxide shift it measurably. A specification therefore allows a window, and the water is within it at release. Measuring pH in unbuffered water is itself difficult, which is another reason for a window rather than a point.

Benzyl alcohol is not ionised and does not affect pH.

What it means for a solution

A peptide arrives as a salt — trifluoroacetate or acetate paired with its basic groups — and carries its own acidic and basic residues. Dissolved in unbuffered water, these set the pH; the water contributes nothing. Two peptides dissolved in identical water give two different pH values. For a copper complex such as GHK-Cu the resulting pH decides whether the metal stays bound.

This is the chemistry behind the solubility and buffering pages elsewhere on this site.

Boundary

This page describes what unbuffered water does and does not do to pH. It does not state what pH any solution should have or how to adjust it.

Bacteriostatic water is supplied by REVIVE LAB UAE as a diluent for lyophilised research peptides, for laboratory research use only. It is not for human or veterinary use, and no dosing, administration or protocol guidance is provided.

What it costs

FormatStrengthPriceAvailability
Bacteriostatic Water3 mL × 2AED 99In stock

Delivery is AED 40 flat and free on orders over AED 700. Payment is cash on delivery anywhere in the UAE, or USDT (TRC20) in advance, which takes 5% off the order total.

Frequently asked

Why a range?

Buffering capacity is the ability to absorb added acid or base without a pH change. Water alone has almost none; a few parts per million of carbon dioxide shift it measurably. A specification therefore allows a window, and the water is within it at release. Measuring pH in unbuffered water is itself difficult, which is another reason for a window rather than a point.

Does REVIVE LAB UAE provide dosing guidance?

No. REVIVE LAB UAE supplies research materials and provides no dosing, administration or protocol guidance of any kind. Every product is sold for laboratory research use only and is not for human or veterinary consumption.

How fast is delivery in the UAE?

Stock is held in Dubai. An order confirmed before 4 PM Dubai time is dispatched the same working day, reaching Dubai and Abu Dhabi the same day and the remaining emirates within 24 hours. Delivery is AED 40 flat and free over AED 700.

Bacteriostatic Water — in stock, dispatched from Dubai
HPLC-verified, lot certificate on every carton, 24-hour delivery nationwide. Browse the catalogue → All peptides UAE

Related reading

Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.