MHB Difference between caustic soda and caustic potash

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WMDhamnekar
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I read the chemical formula for Potassium Hydroxide (Caustic soda)=NaOH (1)I also read the chemical formula for caustic potash having same chemical name Potassium Hydroxide =KOH.

I want to know what is the difference between these two chemical compounds in terms atoms, molecules, ions? Why the name of (1) is not Sodium Hydroxide as it contains sodium(Na)?
 
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It looks like a typo in your book. The name of $\ce{NaOH}$ is indeed Sodium Hydroxide, also known as lye and caustic soda.
 

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