Question: properties of ocean water because it contains salt

title: Seawater
text: The density of surface seawater ranges from about 1020 to 1029 kg / m , depending on the temperature and salinity . At a temperature of 25 ° C , salinity of 35 g / kg and 1 atm pressure , the density of seawater is 1023.6 kg / m . Deep in the ocean , under high pressure , seawater can reach a density of 1050 kg / m or higher . The density of seawater also changes with salinity . Brines generated by seawater desalination plants can have salinities up to 120 g / kg . The density of typical seawater brine of 120 g / kg salinity at 25 ° C and atmospheric pressure is 1088 kg / m . Seawater pH is limited to the range 7.5 to 8.4 . The speed of sound in seawater is about 1,500 m / s ( whereas speed of sound is usually around 330 m / s in air at roughly 1000hPa pressure , 1 atmosphere ) , and varies with water temperature , salinity , and pressure . The thermal conductivity of seawater is 0.6 W / mK at 25 ° C and a salinity of 35 g / kg . The thermal conductivity decreases with increasing salinity and increases with increasing temperature . 

Answer: answer: The density of surface seawater ranges from about 1020 to 1029 kg / m, depending on the temperature and salinity.  Seawater pH is limited to the range 7.5 to 8.4.  The speed of sound in seawater is about 1,500 m / s and varies with water temperature, salinity, and pressure.  The thermal conductivity of seawater is 0.6 W / mK at 25 ° C and a salinity of 35 g / kg.