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For other uses, see PH (disambiguation). pH values of some common substances Acids and Bases Acid Acid–base reaction Acid strength Acidity function Amphoterism Base Buffer solutions Dissociation constant Equilibrium chemistry Extraction Hammett acidity function pH Proton affinity Self-ionization of water Titration Lewis acid catalysis Frustrated Lewis pair Chiral Lewis acid Acid types Brønsted Lewis Acceptor Mineral Organic Strong Superacids Weak Solid Base types Brønsted Lewis Donor Organic Strong Superbases Non-nucleophilic Weak v t e In chemistry, pH ( / p iː ˈ eɪ tʃ / ) is a logarithmic scale used to specify the acidity or basicity of an aqueous solution. It is approximately the negative of the base 10 logarithm of the molar concentration, measured in units of moles per liter, of hydrogen ions. More precisely it is the negative of the base 10 logarithm of the activity of the hydrogen ion. [1] At 25 °C, s

For other uses, see Scarlet fever (disambiguation). Scarlet fever Synonyms Scarlatina, [1] scarletina [2] Strawberry tongue seen in scarlet fever Specialty Infectious disease Symptoms Sore throat, fever, headaches, swollen lymph nodes, characteristic rash [1] Complications Glomerulonephritis, rheumatic heart disease, arthritis [1] Usual onset 5–15 years old [1] Causes Strep throat, streptococcal skin infections [1] Diagnostic method Throat culture [1] Prevention Handwashing, not sharing personal items, staying away from sick people [1] Treatment Antibiotics [1] Prognosis Typically good [3] Scarlet fever is a disease which can occur as a result of a group A streptococcus (group A strep) infection. [1] The signs and symptoms include a sore throat, fever, headaches, swollen lymph nodes, and a characteristic rash. [1] The rash is red and feels like sandpaper and the tongue may be red and bumpy. [1] It most commonly af