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Buffer solution to maintain a constant alkalinity

Buffer solution to maintain a constant alkalinity

T875/0622

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Credit

CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY

Caption

Buffer solution. Bottle containing a buffer solution for maintaining a constant alkalinity. At right is a piece of litmus paper which has turned blue after being dipped in the buffer, showing that it is alkaline. This buffer solution has been made by mixing a weak alkali with the salt that the alkali forms when it reacts with a strong acid. This mixture resists changes in its alkalin- ity (pH). If a strong alkaline is added, then it will react with the salt to form its own salt. If an acid is added it will react with the weak alkali; the lost alkali will be largely replaced as the salt dissociates. The solution loses its buffering abilities as the salt is depleted.

Release details

Model release not required. Property release not required.

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