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slm dostan man ye soal dashtam to in axi ke man mizaram alamat felesh ro be paein manish chie ?manonam komak konid :d pb2+ + cro42- → pbcro4↓ pbcro4↓ + 4naoh → na2[pb(oh)[/font]4] + na2cro4 pbcro4↓ + 2hcl → pbcl2↓ + h2cro4