Registration Dossier
Registration Dossier
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EC number: 231-830-3 | CAS number: 7758-02-3
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
KBr is the salt of KOH and HBr. KOH is a strong base. Thus, K+ cation is a weak conjugate acid because it originated from a strong base (KOH). It will not behave as an acid, hence it does not hydrolyse and will solely be a spectator ion in solution. Similarly, Br¯ anion is a weak conjugate base because it originated from a strong acid (HBr). It will not behave as a base; hence it does not hydrolyse and will solely be a spectator ion in solution. Since neither the potassium ion nor the bromide ion is contributing to the hydronium ion or hydroxide ion concentration in solution, the only source for H3O+ or OH¯ in solution is from the dissociation of water. Thus, the concentration of hydronium ion will be 10-7, and the resulting pH of the solution will be 7.
Key value for chemical safety assessment
Additional information
KBr is the salt of KOH and HBr. KOH is a strong base. Thus, K+ cation is a weak conjugate acid because it originated from a strong base (KOH). It will not behave as an acid, hence it does not hydrolyse and will solely be a spectator ion in solution. Similarly, Br¯ anion is a weak conjugate base because it originated from a strong acid (HBr). It will not behave as a base; hence it does not hydrolyse and will solely be a spectator ion in solution. Since neither the potassium ion nor the bromide ion is contributing to the hydronium ion or hydroxide ion concentration in solution, the only source for H3O+ or OH¯ in solution is from the dissociation of water. Thus, the concentration of hydronium ion will be 10-7, and the resulting pH of the solution will be 7.
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