Editing Citric acid (section)

=== Other uses ===
The [[Buffering agent|buffering]] properties of citrates are used to control [[pH]] in household cleaners and [[pharmaceutical]]s.<ref>{{Cite journal |last1=Greatorex |first1=Jane S. |last2=Page |first2=Rosanna F. |last3=Curran |first3=Martin D. |last4=Digard |first4=Paul |last5=Enstone |first5=Joanne E. |last6=Wreghitt |first6=Tim |last7=Powell |first7=Penny P. |last8=Sexton |first8=Darren W. |last9=Vivancos |first9=Roberto |last10=Nguyen-Van-Tam |first10=Jonathan S. |date=2010-02-01 |title=Effectiveness of Common Household Cleaning Agents in Reducing the Viability of Human Influenza A/H1N1 |journal=PLOS ONE |language=en |volume=5 |issue=2 |pages=e8987 |doi=10.1371/journal.pone.0008987 |doi-access=free |issn=1932-6203 |pmc=2813869 |pmid=20126543|bibcode=2010PLoSO...5.8987G }}</ref><ref>{{Cite journal |last1=Ahmad |first1=Iqbal |last2=Sheraz |first2=Muhammad Ali |last3=Ahmed |first3=Sofia |last4=Kazi |first4=Sadia Hafeez |last5=Mirza |first5=Tania |last6=Aminuddin |first6=Mohammad |date=2011-05-01 |title=Stabilizing effect of citrate buffer on the photolysis of riboflavin in aqueous solution |url=https://www.sciencedirect.com/science/article/pii/S2211286311000066 |journal=Results in Pharma Sciences |volume=1 |issue=1 |pages=11–15 |doi=10.1016/j.rinphs.2011.06.002 |issn=2211-2863|pmc=4150622 }}</ref>

Citric acid is used as an odorless alternative to [[white vinegar]] for fabric dyeing with [[acid dye]]s.<ref>{{Cite web |last=Co |first=Dharma Trading |title=Did You Know... |url=https://www.dharmatrading.com/home/did-you-know-how-acid-dye-works.html |access-date=2025-05-15 |website=Dharma Trading Co. |language=en}}</ref> It can enhance the [[Mordant|mordanting]] process, crosslinking fabrics and dyes through an [[esterification]] reaction.<ref>{{Cite journal |last1=Darmawan |first1=Adi |last2=Widowati |last3=Riyadi |first3=Ahmad |last4=Muhtar |first4=Hasan |last5=Kartono |last6=Adhy |first6=Satriyo |date=2024-09-01 |title=Enhancing cotton fabric dyeing: Optimizing Mordanting with natural dyes and citric acid |url=https://www.sciencedirect.com/science/article/abs/pii/S0141813024048220 |journal=International Journal of Biological Macromolecules |volume=276 |pages=134017 |doi=10.1016/j.ijbiomac.2024.134017 |pmid=39032903 |issn=0141-8130}}</ref>

Sodium citrate is a component of [[Benedict's reagent]], used for both qualitative and quantitative identification of reducing sugars.<ref>{{Cite journal|last1=Chen|first1=Wei|last2=Abramowitz|first2=Matthew K.|date=February 2014|title=Treatment of Metabolic Acidosis in Patients With CKD|journal=American Journal of Kidney Diseases |volume=63|issue=2|pages=311–317|doi=10.1053/j.ajkd.2013.06.017|issn=0272-6386|pmc=3946919|pmid=23932089}}</ref>

Citric acid can be used as an alternative to nitric acid in [[passivation (chemistry)|passivation]] of [[stainless steel]].<ref>{{cite web|url=http://www.euro-inox.org/pdf/map/Passivating_Pickling_EN.pdf |title=Pickling and Passivating Stainless Steel |publisher=Euro-inox.org |access-date=2013-01-01 |url-status=dead |archive-url=https://web.archive.org/web/20120912054431/http://www.euro-inox.org/pdf/map/Passivating_Pickling_EN.pdf |archive-date=September 12, 2012 |df=mdy}}</ref>

Citric acid can be used as a lower-odor [[stop bath]] as part of the process for developing [[photographic film]]. [[Photographic developer]]s are alkaline, so a mild acid is used to neutralize and stop their action quickly, but commonly used [[acetic acid]] leaves a strong vinegar odor in the darkroom.<ref>{{cite web|last=Anchell |first=Steve |url=http://www.focalpress.com/books/details/9780240810553/ |title=The Darkroom Cookbook: 3rd Edition (Paperback) |publisher=Focal Press |access-date=2013-01-01}}</ref>

Citric acid is an excellent [[soldering]] [[Flux (metallurgy)|flux]],<ref>{{cite web|url=https://apps.dtic.mil/dtic/tr/fulltext/u2/a295042.pdf |archive-url=https://web.archive.org/web/20200315161916/https://apps.dtic.mil/dtic/tr/fulltext/u2/a295042.pdf |url-status=dead |archive-date=March 15, 2020 |title=An Investigation of the Chemistry of Citric Acid in Military Soldering Applications  |date=1995-06-19}}</ref> either dry or as a concentrated solution in water. It should be removed after soldering, especially with fine wires, as it is mildly corrosive.  It dissolves and rinses quickly in hot water.

[[Alkali citrate]] can be used as an inhibitor of kidney stones by increasing urine citrate levels, useful for prevention of calcium stones, and increasing urine pH, useful for preventing uric acid and cystine stones.<ref>{{Cite journal |last1=Berg |first1=C. |last2=Larsson |first2=L. |last3=Tiselius |first3=H. G. |date=1992 |title=The effects of a single evening dose of alkaline citrate on urine composition and calcium stone formation |url=https://pubmed.ncbi.nlm.nih.gov/1507355/ |journal=The Journal of Urology |volume=148 |issue=3 Pt 2 |pages=979–985 |doi=10.1016/s0022-5347(17)36795-2 |issn=0022-5347 |pmid=1507355}}</ref>