Why did my lead nitrate solution precipitate?

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What is good idea to block AuNPs surface?

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Frank T. Edelmann

Dear Muhammad Nur Hasan, normally lead(II) nitrate, Pb(NO3)2, is very soluble in water. However, since you have slightly basic conditions, chances are that the mixture doesn't stay clear but you got some precipitate of lead(II) hydroxide, Pb(OH)2. Lead(II) hydroxide is a white solid which is insoluble in water. Was your precipitate white?