Ch\u01b0\u01a1ng 8 – B\u00e0i 54: B\u00e0i th\u1ef1c h\u00e0nh 8: Nh\u00e2n bi\u1ec7t m\u1ed9t s\u1ed1 ion trong dung d\u1ecbch<\/a><\/blockquote><\/iframe>