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Merck

339261

Hydrofluoric acid

48 wt. % in H2O, ≥99.99% trace metals basis

Synonym(s):

HF

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About This Item

Empirical Formula (Hill Notation):
HF
CAS Number:
7664-39-3
Molecular Weight:
20.01
NACRES:
NA.21
PubChem Substance ID:
329754538
UNSPSC Code:
12352106
MDL number:
MFCD00011346
Assay:
≥99.99% trace metals basis
Concentration:
48 wt. % in H2O
Form:
liquid

Key Documents

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InChI

1S/FH/h1H

SMILES string

[H+].[F-]

InChI key

KRHYYFGTRYWZRS-UHFFFAOYSA-N

vapor density

1.27 (vs air), 1.27 (vs air)

vapor pressure

25 mmHg ( 20 °C)

assay

≥99.99% trace metals basis

form

liquid

concentration

48 wt. % in H2O

density

1.15 g/mL at 25 °C (lit.)

Quality Level

200

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General description

Hydrofluoric acid (HF) is the 48% solution of HF in water. It is weakly acidic in nature. Aqueous HF is mostly used in etching silicon in semiconductors and producing inorganic fluoride compounds. HF can also be used as fluorinating and deprotecting agent. As fluorination agent it also forms complexes with organic bases.

Application

Hydrofluoric acid is used:
  • To compose the electrolyte for the synthesis of TiO2 nanotube arrays.
  • As etchant for the glass fibers.
  • As capping reagent for the synthesis of anatase TiO2 nanocrystals/nanosheets.

wgk

WGK 2

pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

Hazard Classifications

Acute Tox. 1 Dermal - Acute Tox. 2 Inhalation - Acute Tox. 2 Oral - Eye Dam. 1 - Skin Corr. 1A

Storage Class

6.1B - Non-combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
MKCZ2842
MKCX0750
MKCX1204
MKCW5246
MKCV8964

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Highly-ordered TiO2 nanotube arrays up to 220μm in length: use in water photoelectrolysis and dye-sensitized solar cells.
Shankar K, et al.
Nanotechnology, 18(6), 065707-065707 (2007)
Anatase TiO2 nanosheet: an ideal host structure for fast and efficient lithium insertion/extraction.
Chen JS and Lou XW.
Electrochemical Communications, 11(12), 2332-2335 (2009)
Francesca Monticelli et al.
Dental materials : official publication of the Academy of Dental Materials, 22(7), 602-609 (2005-11-18)
To verify the influence of different etching procedures of the post-surface on microtensile bond strength values between fiber posts and composite core materials. 60 DT Light Posts were divided into 10 subgroups using five different chemical surface treatments and two
Eagleson M.
Concise Encyclopedia Chemistry, 508-508 (1994)
Philip J Millar et al.
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