Does asking for peoples' Duas when donating a water well and requesting them to pray for your family on the well's plaque invalidate your charity and make it an act for something other than Allah? Or is it acceptable as a sincere act of charity?
Charity done for the sake of Allah, does not need people to pray for you or your family as Allah Knows you and your family and Grants reward of the charity to everyone who sincerely does good.
'Requesting people to pray for you or your family does not invalidate your charity, as far as your intention behind the charity was for the sake of Allah.
'Wassalam.