silicic acid: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “silicic acid” mean?
A general term for compounds containing silicon, oxygen, and hydrogen, with the chemical formula SiO₂·nH₂O, a precursor to silica and silicates.
Audio
Pronunciation
Definition
Meaning and Definition
A general term for compounds containing silicon, oxygen, and hydrogen, with the chemical formula SiO₂·nH₂O, a precursor to silica and silicates.
In geology and environmental science, silicic acid is a weak acid dissolved in water, particularly significant in the formation of biogenic silica (like diatom shells) and in the weathering of rocks.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning. Spelling conventions follow general rules (e.g., 'behaviour of silicic acid' in BrE vs. 'behavior of silicic acid' in AmE).
Connotations
None beyond the scientific context.
Frequency
Equally low frequency and confined to technical fields in both variants.
Grammar
How to Use “silicic acid” in a Sentence
The [process/weathering] releases silicic acid [into the water].Silicic acid reacts with [base/metal] to form [silicate].Vocabulary
Collocations
Examples
Examples of “silicic acid” in a Sentence
verb
British English
- The mineral gradually silicifies as silicic acid precipitates.
- The solution was analysed to determine if it had silicified.
American English
- The rock silicifies as silicic acid polymerizes.
- They analyzed the sample to see if it had silicified.
adverb
British English
- [No standard adverbial form derived directly from 'silicic acid']
American English
- [No standard adverbial form derived directly from 'silicic acid']
adjective
British English
- The silicic acid concentration was measured colourimetrically.
- They studied the silicic acid flux from the sediments.
American English
- The silicic acid concentration was measured colorimetrically.
- They studied the silicic acid flux from the sediments.
Usage
Meaning in Context
Business
Rare; potentially in industries related to water treatment, cosmetics (as an ingredient), or silica gel production.
Academic
Primary context. Used in chemistry, geology, oceanography, soil science, and environmental engineering journals and textbooks.
Everyday
Virtually never used.
Technical
The standard context. Used precisely in scientific reports, laboratory protocols, and material safety data sheets (MSDS).
Vocabulary
Synonyms of “silicic acid”
Strong
Neutral
Weak
Vocabulary
Antonyms of “silicic acid”
Watch out
Common Mistakes When Using “silicic acid”
- Misspelling as 'silicone acid' (silicone is a polymer).
- Using it as a countable noun (e.g., 'a silicic acid') instead of an uncountable/mass noun.
- Confusing it with 'hydrofluosilicic acid' (a different compound).
FAQ
Frequently Asked Questions
In its dilute, natural forms (e.g., in drinking water), it is generally considered benign. Concentrated solutions or the powdered acid can be irritants. Always consult safety data sheets for specific handling instructions.
Silicic acid refers to the soluble, hydrated forms of silicon dioxide (SiO₂·nH₂O) in water. 'Silica' is a broader term for silicon dioxide in all its forms, most commonly as an insoluble solid like quartz or sand.
Trace amounts are present in some drinking water and mineral waters. It is also a key ingredient in some 'bioavailable silicon' dietary supplements and may be used in certain cosmetic formulations.
It is an essential nutrient for diatoms, radiolarians, and other silica-secreting plankton. Their uptake of silicic acid drives the biological silica pump, a major cycle influencing marine ecology and the global carbon cycle.
A general term for compounds containing silicon, oxygen, and hydrogen, with the chemical formula SiO₂·nH₂O, a precursor to silica and silicates.
Silicic acid is usually technical/scientific in register.
Silicic acid: in British English it is pronounced /sɪˌlɪsɪk ˈasɪd/, and in American English it is pronounced /səˌlɪsɪk ˈæsɪd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms exist for this technical term]”
Learning
Memory Aids
Mnemonic
Think 'SILICon' + 'IC' (as in acidic) = SILICIC ACID. It's the acidic, soluble form of the silicon found in glass (silica).
Conceptual Metaphor
[Not typically applicable for this technical chemical term]
Practice
Quiz
In which field is the term 'silicic acid' most precisely and frequently used?