.pk

The logarithm (to the base 10) of the reciprocal of the equilibrium constant for a specified reaction under specified conditions (for example, solvent and temperature). The pK values are often more convenient to tabulate and use than the equilibrium constants themselves. The value of K for the dissociation of the HSO₄⁻ ion in aqueous solution at 25°C (77°F) is 0.0102 mole/liter. The logarithm is 0.008₆ − 2 = −1.991₄ The pK is therefore +1.991₄. The choice of algebraic sign, although arbitrary, results in positive values for most dissociation constants applicable to aqueous solutions. The concept of pK is especially valuable in the study of solutions. See also Chemical equilibrium; Ionic equilibrium; pH.

1. The negative logarithm of the dissociation constant of an electrolyte.
2. A value equal to the pH at which equal concentrations of the acidic and basic forms of a substance are present.

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.pk

Introduced	1992
TLD type	Country code top-level domain
Status	Active
Registry	PKNIC
Sponsor	PKNIC
Intended use	Entities connected with  Pakistan
Actual use	Popular in Pakistan
Registration restrictions	Some subdomains have restrictions, but some are unrestricted
Structure	Registrations have been at third level beneath second-level labels, but second-level names are being opened up in 2005
Documents	Domain registration policy
Dispute policies	UDRP (amended)
Website	PK NIC

.pk is the Internet country code top-level domain (ccTLD) for Pakistan. The domain is operated by PKNIC.

Second level domains

As of 2005, second-level registration for the .pk domain became available.

• .pk (available to anyone; used by companies, individuals, and organizations in Pakistan)
• .com.pk (available to anyone; used by companies, individuals, and organizations in Pakistan)
• .net.pk (for network related businesses and Internet service providers)
• .edu.pk (for educational institutes)
• .org.pk (for non-profit organizations)
• .fam.pk (for individuals)
• .biz.pk (for general business use)
• .web.pk (originally for websites)
• .gov.pk (Government of Pakistan)
• .gob.pk (Domains for the Government of Balochistan)
• .gok.pk (Domains for the Government of Azad Kashmir)
• .gon.pk (Domains for the Government of NWFP)
• .gop.pk (Domains for the Government of Punjab)
• .gos.pk (Domains for the Government of Sindh)

External links

• PKNIC Official Website
• IANA .pk whois information

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