Salts & brines

Sodium bicarbonate · NaHCO3

Name: Sodium bicarbonate (NaHCO3) aqueous solution properties
Creator: ProcessConvert
License: https://creativecommons.org/licenses/by/4.0/

Sodium bicarbonate (NaHCO3) is a salt; this page gives computed density for aqueous solutions from 1–8 wt% and 10–50 °C.

Values are computed from the Laliberté (2009) aqueous-electrolyte correlation and tabulated over 1–8 wt% and 10–50 °C.

Also known as: Baking soda, Bicarbonate of soda, Sodium hydrogen carbonate
CAS number: 144-55-8
Tabulated range: 1–8 wt% · 10–50 °C
Properties: Density · Specific gravity

At 6 wt% · 20 °C

reference snapshot

Density: 1041.4kg/m³
Density: 1.0414g/cm³
Specific gravity: 1.043

Explore

Read a value at any point

Move the sliders to interpolate between the tabulated grid points. The readout and chart never go outside the validated 1–8 wt% and 10–50 °C range, and every number is interpolated from the committed table below — nothing is computed from a chemistry model in your browser.

Interactive explorer

Values are interpolated between the tabulated grid points below — sliders stay within the validated 1–8 wt% and 10–50 °C range.

Concentration5 wt%

Temperature20 °C

Density: 1034.3 kg/m³
Density: 1.0343 g/cm³
Specific gravity: 1.036

Density (kg/m³) vs wt% NaHCO3 at 20 °C — Sodium bicarbonate.

Why it matters

What the numbers tell you

At 6 wt% and 20 °C, aqueous sodium bicarbonate has a density of about 1041 kg/m³ (1.041 g/cm³) — roughly 1.04× the density of water. That difference carries straight into volume-to-mass conversions and pump and pipe sizing.

Common grades

A few working strengths

Properties at 20 °C for a handful of concentrations in everyday use, read from the committed grid (interpolated between tabulated points where a grade falls between them). The full table follows below.

wt% NaHCO3	°C	Density kg/m³	SG
2	20	1012.8	1.015
4	20	1027.2	1.029
6	20	1041.4	1.043
8	20	1055.7	1.058

Sources

Where the numbers come from

Every value on this page is computed by a deterministic model — none is entered by hand. The generating method and the references it is checked against:

▸Laliberte, M. (2009). A Model for Calculating the Heat Capacity of Aqueous Solutions, with Updated Density and Viscosity Data. J. Chem. Eng. Data 54(6), 1725-1760. doi:10.1021/je8008123
▸CRC Handbook of Chemistry and Physics - Concentrative Properties of Aqueous Solutions (density at 20 degC; primary data Wolf 1966 / Sohnel & Novotny 1985)
▸CRC Handbook of Chemistry and Physics - Aqueous Solubility of Inorganic Compounds at Various Temperatures (solubility bound for the tabulated range)

Model: thermo==0.4.0 (chemicals==1.3.0) - Laliberte 2009 electrolyte correlation · Generated 2026-06-07

The committed data file for this page is published as JSON on GitHub under CC BY 4.0.

Validation

Checked against a cited value

The model is cross-checked at one independently cited reference point. The page is published only because this check passes.

Property / point	Density · 6 wt% · 20 °C
Cited reference value	1041.3 kg/m3
Model computed	1041.43 kg/m3
Error vs reference	0.012% (tolerance 1%)

CRC Handbook of Chemistry and Physics - Concentrative Properties of Aqueous Solutions. CRC Handbook of Chemistry and Physics, Concentrative Properties of Aqueous Solutions (all data at 20 degC; primary data Wolf 1966 / Sohnel & Novotny 1985), sodium bicarbonate: 6.0 mass % at 20 degC = 1.0413 g/cm3.

Full tables

Every tabulated point

Rows are temperature (°C); columns are concentration (wt% NaHCO3). Read the cell at the intersection. Specific gravity is density divided by the model water reference of 998.2 kg/m³ at 20 °C.

Density — kg/m³

°C \ wt%	1	2	3	4	5	6	7	8
10	1007.3	1014.7	1022.1	1029.4	1036.6	1043.7	1050.9	1058.0
15	1006.5	1013.9	1021.2	1028.4	1035.6	1042.7	1049.8	1057.0
20	1005.5	1012.8	1020.0	1027.2	1034.3	1041.4	1048.6	1055.7
25	1004.3	1011.4	1018.6	1025.7	1032.8	1039.9	1047.0	1054.2
30	1002.8	1009.9	1017.0	1024.0	1031.1	1038.2	1045.3	1052.5
35	1001.1	1008.1	1015.1	1022.2	1029.2	1036.3	1043.4	1050.6
40	999.2	1006.1	1013.1	1020.1	1027.2	1034.3	1041.4	1048.6
45	997.1	1004.0	1011.0	1017.9	1025.0	1032.1	1039.2	1046.4
50	994.9	1001.7	1008.6	1015.6	1022.6	1029.7	1036.9	1044.1

Typical values

Sodium bicarbonate solution properties at 25 °C

At 25 °C, 2 wt% sodium bicarbonate has a density of about 1011.4 kg/m³. At 25 °C, 6 wt% sodium bicarbonate has a density of about 1039.9 kg/m³. At 25 °C, 8 wt% sodium bicarbonate has a density of about 1054.2 kg/m³.

Limitations

Before you use these numbers

▸Laliberte (2009) aqueous-electrolyte correlation for NaHCO3-water density. Tabulated for 1-8 wt% over 10-50 degC. Sodium bicarbonate has a low solubility (about 9-10 wt% at 20 degC), so the 8 wt% ceiling keeps the whole table below saturation. Viscosity and heat capacity are not tabulated: the correlation's NaHCO3 viscosity data covers only 20-30 degC and its heat-capacity data is a single 25 degC point, so both are omitted rather than extrapolated. Concentrations are NaHCO3 by mass. Values are for preliminary design; verify against vendor data for critical service.
▸Values are tabulated only inside the 1–8 wt% and 10–50 °C ranges shown; the correlation is not extrapolated beyond them here.
▸Figures are for a pure sodium bicarbonate–water system. Commercial grades contain impurities (for example chloride in some caustic grades) that shift density and viscosity; check the supplier's data sheet for a specific product.
▸Use for preliminary design; verify for critical service.

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